Reviving this thread, because MkIV's default behaviour is still improper. The current default of always adding a space after periods *and* commas is expected by nobody, I think. Revival prompted by a recent tex.se question: http://tex.stackexchange.com/questions/84911/number-kerning-in-context-math-... I've set out the behaviour below; A --> B means 'A displays as B'. MkIV should probably follow either MkII, or the behavior Aditya and Marcin proposed. (Actually, even if we choose MkII behavior, it would be nice to have the latter available, too. Maybe as an option autopunctuation=user? It would require someone to hack respace[math_char] in math-noa.lua, though.) Cheers, Sietse == This is MkIV's behaviour == Spaces are ignored. \setupmathematics[autopunctuation=no] (the default) 2,5 --> 2, 5 2.5 --> 2. 5 \setupmathematics[autopunctuation=yes] 2,5 --> 2,5 2.5 --> 2.5 Spaces are ignored. == This is MkII's behaviour == Spaces are ignored. Without \enablemathpunctuation (no \disablemathpunctuation): % default TeX behaviour 2.5 or 2. 5 --> 2.5 2,5 --> 2, 5 \enablemathpunctuation: 2.5 --> 2.5 2,5 --> 2,5 == This would be really nice == See Aditya and Marcin's mails, further up this thread. http://www.mail-archive.com/ntg-context@ntg.nl/msg66306.html http://www.mail-archive.com/ntg-context@ntg.nl/msg66307.html Spaces are significant. \setupmathematics[autopunctuation=no] % standard TeX behaviour 2,5 --> 2, 5 2, 5 --> 2, 5 2.5 --> 2.5 2. 5 --> 2.5 \setupmathematics[autopunctuation=yes] % user controls spacing without needing to type 2,\, 5 all the time % decimal-mark agnostic % but especially when the decimal mark is a comma 2,5 --> 2,5 2, 5 --> 2, 5 2.5 --> 2.5 2. 5 --> 2. 5