Proposal for math mappings

Aditya Mahajan

10 Dec 2010 10 Dec '10

5:49 a.m.

This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not. There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z) A user may want to control what each range is mapped to. So, I suggest a setup command \setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ] where the options for style are normal, bold while the options for alternative are normal, italic, sans, sansitalic, blackboard, script This command will the mappings for each range. **NOTE**: All combinations are not valid. A companion command \definemathmappings [whatever] [....] can be used to define multiple mappings. These mappings can be used by \setupmathmappings[whatever] (An alternative is that these mappings are activated using \whatever ...) For example, we can define a command to typeset vectors using \definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}] \def\VEC{\groupedcommand{\setupmathmappings[vector]}{}} If later, we want to represent vectors as sans serif, we can use \definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}] This interface makes it easy to switch math fonts for disiplines that want different style for different alphabet ranges. It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users. Would the above interface take care of different use cases, or is it missing something? Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms. Which way of specifying the keys do you prefer? Aditya

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Vladimir Lomov

10 Dec 10 Dec

1:41 p.m.

Hi. ** Aditya Mahajan [2010-12-09 23:49:26 -0500]:

...

This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z) Should be: αβγ..ω and ΑΒΓ..Ω A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}} Is it should be \def\VEC{\groupedcommand{\setupmathmappings[vectors]}{}} ?

If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This interface makes it easy to switch math fonts for disiplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something? IMHO, style is already used so it is normal. Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript This very depends on used fonts. with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Aditya Actually I don't get what you try to do. I thought that 'font switching' command should take care of font switching either in math or text modes (if typescript is set properly). Right now the only good example of usage of proposed mechanism is \VEC command (for vectors and etc).

--- WBR, Vladimir Lomov. -- I share the belief of many of my contemporaries that the spiritual crisis pervading all spheres of Western industrial society can be remedied only by a change in our world view. We shall have to shift from the materialistic, dualistic belief that people and their environment are separate, toward a new conciousness of an all-encompassing reality, which embraces the experiencing ego, a reality in which people feel their oneness with animate nature and all of creation. - Dr. Albert Hoffman

Aditya Mahajan

4:29 p.m.

On Fri, 10 Dec 2010, Vladimir Lomov wrote:

...

** Aditya Mahajan [2010-12-09 23:49:26 -0500]:

...
This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z) Should be: αβγ..ω and ΑΒΓ..Ω

Thanks. I need to learn my Greek :)

...

...
A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}} Is it should be \def\VEC{\groupedcommand{\setupmathmappings[vectors]}{}} ?

Indeed. Thanks.

...

...
If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This interface makes it easy to switch math fonts for disiplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something? IMHO, style is already used so it is normal. Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript

...

This very depends on used fonts.

I am assuming a complete opentype math font.

...

...
with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Actually I don't get what you try to do.

I'll try to explain better in a later post.

...

I thought that 'font switching' command should take care of font switching either in math or text modes (if typescript is set properly).

I am proposing to separate out math font switching from text mode font switching.

...

Right now the only good example of usage of proposed mechanism is \VEC command (for vectors and etc).

Otared Kavian

11 Dec 11 Dec

4:24 p.m.

Dear Aditya, I do think that your proposal would be of great help in writing mathematics. Indeed the use of different alphabets, or range of characters with different styles, depend on the fields of mathematics, so having a \setup command like the one you suggest would be wonderful. However, IMHO, the new setup command should follow the general rules of ConTeXt commands for setting up different environments. So maybe the option of having all the 12 forms, as you suggest, normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript would be more homogeneous with the usual style choice. Best regards: OK On 10 déc. 2010, at 16:29, Aditya Mahajan wrote:

...

On Fri, 10 Dec 2010, Vladimir Lomov wrote:

...
** Aditya Mahajan [2010-12-09 23:49:26 -0500]:

...
This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z) Should be: αβγ..ω and ΑΒΓ..Ω

Thanks. I need to learn my Greek :)

...
...
A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}} Is it should be \def\VEC{\groupedcommand{\setupmathmappings[vectors]}{}} ?

Indeed. Thanks.

...
...
If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This interface makes it easy to switch math fonts for disiplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something? IMHO, style is already used so it is normal. Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript

...
This very depends on used fonts.

I am assuming a complete opentype math font.

...
...
with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Actually I don't get what you try to do.

I'll try to explain better in a later post.

...
I thought that 'font switching' command should take care of font switching either in math or text modes (if typescript is set properly).

I am proposing to separate out math font switching from text mode font switching.

...
Right now the only good example of usage of proposed mechanism is \VEC command (for vectors and etc).

More on this later.

Aditya

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Procházka Lukáš Ing. - Pontex s. r. o.

10 Dec 10 Dec

2:49 p.m.

On Fri, 10 Dec 2010 05:49:26 +0100, Aditya Mahajan wrote:

...

This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z)

Just to confirm - - 0-9 are 48-57 in ASCII - a-z = 97-122 - A-Z = 65-90 - LC Greek = ?-? (given by \alpha to \omega range) - UC Greek = ?-? (given by \Alpha to \Omega range) - Is that right?

...

A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

OK, it might be useful when one wants e.g. ALL Greek letters to be printed somehow, e.g. bold. I don't think that the basic criterion for style in math is the (alphabet) range, it's rather the meaning of maths (variable/parameter/vector/tensor/operator (e.g. Nabla operator)). But OK -

...

where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}}

Or rather the following (?): \def\VEC#1{\groupedcommand{\setupmathmappings[vector]}{#1}}

...

If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This kind of switching would be great.

...

This interface makes it easy to switch math fonts for disciplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something?

It looks good. Some examples would be needed, starting at simple ones and ending with "wildly" switching math formulas.

...

Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript

with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Personally, no matter. Programming "clarity" should be kept at most - so it's up to you. When some samples are provided, someone will follow them. Thank for your effort. Lukas

...

Aditya

-- Ing. Lukáš Procházka [mailto:LPr@pontex.cz] Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz] Bezová 1658 147 14 Praha 4 Tel: +420 244 062 238 Fax: +420 244 461 038

Aditya Mahajan

4:22 p.m.

On Fri, 10 Dec 2010, Procházka Lukáš Ing. - Pontex s. r. o. wrote:

...

On Fri, 10 Dec 2010 05:49:26 +0100, Aditya Mahajan wrote:

...
This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z)

Just to confirm -

- 0-9 are 48-57 in ASCII - a-z = 97-122 - A-Z = 65-90 - LC Greek = ?-? (given by \alpha to \omega range) - UC Greek = ?-? (given by \Alpha to \Omega range)

- Is that right?

Yes. In addition, Greek will work even if you key in 0x0391-0x03C9.

...

...
A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

OK, it might be useful when one wants e.g. ALL Greek letters to be printed somehow, e.g. bold.

I don't think that the basic criterion for style in math is the (alphabet) range, it's rather the meaning of maths (variable/parameter/vector/tensor/operator (e.g. Nabla operator)). But OK -

...
where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}}

Or rather the following (?): \def\VEC#1{\groupedcommand{\setupmathmappings[vector]}{#1}}

I haven't tested this, but I think that my definition should work (after changing vector -> vectors). The point of grouped command is that you can use \VEC{ABC} as well as {\VEC ABC} If you only need the first variant, you can simply define \def\VEC#1{{\setupmathmappings[vectors]#1}}

...

...
If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This kind of switching would be great.

...
This interface makes it easy to switch math fonts for disciplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something?

It looks good. Some examples would be needed, starting at simple ones and ending with "wildly" switching math formulas.

...
Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript

with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Personally, no matter. Programming "clarity" should be kept at most - so it's up to you. When some samples are provided, someone will follow them.

I will provide a more detailed example. Aditya

Aditya Mahajan

11 Dec 11 Dec

5:28 p.m.

I'll try once more to explain the setup. If I understand the unicode philosopy correctly, then we do not any font switching macros in math. If we want math italic A, we can simply type 0x1D434; if we want math bold A, we can type 0x1D400; and so on. One difficulty with this approach is that it is not easy to type (and see) these characters in an editor. One way to circumvent this, as is done by the latex unicode-math package, is to define a macro for each symbol: \mathitA, \mathbfA, etc. Even if we define such macros, writing such macros is inconvinient. A more nature way is to write $A {\bf A}$ rather than $\mathitA \mathbfA$ etc. Traditionally, commands like \bf, \it, etc are font switches. However, in unicode math, rather than font switches, these macros are simply input mapping commands. Thus, by default, 0x0041 (latin A) maps to 0x1D434 (math italic A), and so on. If \bf is active, 0x0041 (latin A) maps to 0x1D400 (math bold A), and so on. Roughly speaking, this is how \bf. \it, \bi, \cal, \Bbd, etc work in the background. However, at present these mappings are unsatisfactory. For example, by default, 0x03B1 (Greek alpha) maps 0x1D6FC (Math italic small alpha), while 0xO391 (Greek capital Alpha) maps to itself. What should these mappings be when \bf is active? Or when \bi is active? The trouble with the current implementation of \bf, \bi, \cal, etc is that these mappings are not explicitly specified. My proposal is to allow users to customize these mappings. I agree that digits, upper and lower case latin and greek does not capture all mathematic characters for which such mappings are needed. Similar mappings might also be needed for some symbols like nabla (are there other such symbols?). These can also be added as a key like nabla={normal,italic} or nabla={bold,normal} Hopefully, the above explanation makes more sense. Aditya On Thu, 9 Dec 2010, Aditya Mahajan wrote:

...

This is a proposal for a new way of selecting math mappings in MkIV. I want to get input from other math users whether this syntax would take care of all scenarios or not.

There are five different ranges in mathematics: - digits (0..9) - lower case Latin (abc..z) - upper case Latin (ABC..Z) - lower case Greek (αβγ..ζ) - upper case Greek (ΑΒΓ..Z)

A user may want to control what each range is mapped to. So, I suggest a setup command

\setupmathmappings [ digits={style,alternative}, lclatin={style,alternative}, uclatin={style,alternative}, lcgreek={style,alternative}, ucgreek={style,alternative}, ]

where the options for style are

normal, bold

while the options for alternative are

normal, italic, sans, sansitalic, blackboard, script

This command will the mappings for each range. **NOTE**: All combinations are not valid.

A companion command

\definemathmappings [whatever] [....]

can be used to define multiple mappings. These mappings can be used by

\setupmathmappings[whatever]

(An alternative is that these mappings are activated using \whatever ...)

For example, we can define a command to typeset vectors using

\definemathmappings [vectors] [ digits={bold,normal}, lclatin={bold,normal}, uclatin={bold,normal}, lcgreek={bold,normal}, ucgreek={bold,normal}]

\def\VEC{\groupedcommand{\setupmathmappings[vector]}{}}

If later, we want to represent vectors as sans serif, we can use

\definemathmappings [vectors] [ digits={normal,sans}, lclatin={normal,sans}, uclatin={normal,sans}, lcgreek={normal,sans}, ucgreek={normal,sans}]

This interface makes it easy to switch math fonts for disiplines that want different style for different alphabet ranges.

It is relatively easy to implement the above interface. All we need is some bookkeeping to set the right attributes. The default math mapping commands can be reimplmeneted using \definemappings. Before implementing this, I want to ask the opinion of other math users.

Would the above interface take care of different use cases, or is it missing something?

Finally, I am not too happy with the syntax. There are only a few ConTeXt commands in which the keys take a pair of values. Another option is to allow all 12 valid options

normal, italic, sans, sansitalic, blackboard, script, bold, bolditlaic, boldsans, boldsansitalic, boldblackboard, boldscript

with the variants sansitalic-italicsans, boldsans-sansbold, etc. as synonmyms.

Which way of specifying the keys do you prefer?

Aditya

Procházka Lukáš

12 Dec 12 Dec

5:15 p.m.

Hello, thanks for the deeper explanation - On Sat, 11 Dec 2010 17:28:55 +0100, Aditya Mahajan wrote:

...

I agree that digits, upper and lower case latin and greek does not capture all mathematic characters for which such mappings are needed. Similar mappings might also be needed for some symbols like nabla (are there other such symbols?). These can also be added as a key like

nabla={normal,italic}

or

nabla={bold,normal}

I came to work with some similar operators in differential geometry, so as I remember or I can find: grad (also horizontally flipped greek Delta) div (looking like normal greek Delta) curl, rot - the same as div (but in R3 space, whilst div is for R1) Laplace operator Lukas

...

Aditya

Aditya Mahajan

13 Dec 13 Dec

3:15 p.m.

On Sun, 12 Dec 2010, Procházka Lukáš wrote:

...

Hello, thanks for the deeper explanation -

On Sat, 11 Dec 2010 17:28:55 +0100, Aditya Mahajan wrote:

...
I agree that digits, upper and lower case latin and greek does not capture all mathematic characters for which such mappings are needed. Similar mappings might also be needed for some symbols like nabla (are there other such symbols?). These can also be added as a key like

nabla={normal,italic}

or

nabla={bold,normal}

I came to work with some similar operators in differential geometry, so as I remember or I can find:

grad (also horizontally flipped greek Delta) div (looking like normal greek Delta) curl, rot - the same as div (but in R3 space, whilst div is for R1) Laplace operator

Unlike Nabla, these characters do not have any bold or sans-serif variants, so it does not make sense to define math-mappings for them. The only other character that I could find with multiple alternatives is the partial symbol. So, I suggest the following macro: \definemathmappings % and \setupmathmappings [....] [digits=..., uclatin=...., lclatin=...., ucgreek=..., lcgreek=..., nabla=..., partial=...] Other symbols (blackboard sum, differential operator, etc) are better handled by a dedicated macro rather than input mappings. If there are no other concerns, Hans, Mojca, and I can take this offline. Aditya

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Aditya Mahajan
Otared Kavian
Procházka Lukáš
Procházka Lukáš Ing. - Pontex s. r. o.
Vladimir Lomov