It’s true that \vtop{…} does the job for a single line of items, but it doesn’t in the case there’re multiple (\vtop{}) aligns with the bottom.

Here’s a modified MWE

\startitemize[n][style=\bf]
  \item \godown[-\lineheight] \startitemize [a,columns,two,packed,broad][stopper=),before={\blank[nowhite]}]
    \item $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
    \item $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
    \item $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
    \item $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
  \stopitemize
\stopitemize

A. Christe
Le 22 août 2023 à 04:08 +0200, fv leung <fvleung@gmail.com>, a écrit :
I'd do it this way:

\starttext
\startitemize[n][style=\bf]
\item\vtop{%
  \startitemize[a,horizontal,four][stopper=\)]
    \startitem
      $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
    \stopitem
    \startitem
      $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
    \stopitem
    \startitem
      $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
    \stopitem
    \startitem
      $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
    \stopitem
  \stopitemize
}
\stopitemize

\stoptext

Alexandre Christe <aleks.christe@gmail.com> 於 2023年8月22日 週二 上午2:58寫道:
Dear ConTeXt users,

Time goes by but I haven't yet found a nice solution to this issue. When having mathematics, I'd not like to adjust by hand the factor of \linewidth for the \godown command.

Here's a MWE

\starttext

\startitemize[n][style=\bf]
  \item \godown[-\lineheight] \startitemize [a,columns,four,packed,broad][stopper=),before={\blank[nowhite]}]
    \item $6(x - \dfrac{5}{12})^2 - \dfrac{1}{24}$
    \item $-3(x - \dfrac{1}{3})^2 + \dfrac{1}{3}$
    \item $7(x + \dfrac{5}{14})^2 + \dfrac{199}{28}$
    \item $-\dfrac{1}{2}(x + 2)^2 + \dfrac{9}{2}$
  \stopitemize
\stopitemize

\stoptext

Thanks in advance.

Le ven. 2 sept. 2022 à 11:24, fv leung via ntg-context <ntg-context@ntg.nl> a écrit :

\starttext

\startitemize[n]
\item\godown[-\lineheight]
  \startitemize[a,columns,packed][before={\blank[nowhite]},right=\),stopper=]
  \item bla
  \item bla
  \item bla
  \item bla
  \stopitemize
\item\godown[-\lineheight]
  \startitemize[a,columns,packed][before={\blank[nowhite]},n=3,right=\),stopper=]
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \stopitemize
\item\godown[-\lineheight]
  \startitemize[a,columns,packed][before={\blank[nowhite]},n=4,right=\),stopper=]
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
  \stopitemize
\stopitemize

\stoptext

Alexandre Christe via ntg-context <ntg-context@ntg.nl> 於 2022年9月2日 週五 下午5:08寫道:
Dear all,

I'm struggling to setup a nested itemize with no blank line and several columns.

What I mean is something like
1. a) bla   c) bla
    b) bla   d) bla

The following MWE is my starting point

\starttext
\startitemize[n]
\item \blank[-line]
\startitemize[a,horizontal,two] [margin=2cm]
\item First
\item Second
\item Third
\item Fourth
\stopitemize
\item \blank[-line]
\startitemize[a,horizontal,columns,two]
\item First
\item Second
\item Third
\item Fourth
\stopitemize
\stopitemize
\stoptext

Thanks in advance
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : https://contextgarden.net
___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
webpage : https://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : https://contextgarden.net
___________________________________________________________________________________