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Dear list members: I would like to set up Tex Gyre Adventor sans serif font as my math font (even if it doesn't have math symbols). I have two questions related to this problem. 1. In latex I can specify math font versions, define a specific font as math serif / normal, another as math sans serif etc. (http://milde.users.sourceforge.net/LUCR/Math/math-font-selection.xhtml). Is this possible in context, and if yes, how? 2. If I specify Tex Gyre Adventor as default math font in context, I get compile error. Here is a MWE, file name is mathfont.tex: -------- \definefontfamily [mathfont] [sf] [Tex Gyre Bonum] \definefontfamily [mathfont] [mm] [Tex Gyre Adventor] \setupbodyfont[mathfont,10pt] \starttext Normal text. \math{Inline math expression.} Normal text. \stoptext -------- Running context mathfont.tex gives: This is LuaTeX, Version 0.98.3 (TeX Live 2017/dev) system commands enabled. .... tex error > tex error on line 9 in file ..../mathfont.tex: ! Math error: parameter \Umathquad\textstyle is not set \m_syst_action_nop ...artimath #1\normalstopimath \fi l.9 \math{Inline math expression.} 1 \definefontfamily [mathfont] [sf] [Tex Gyre Bonum] 2 \definefontfamily [mathfont] [mm] [Tex Gyre Adventor] 3 \setupbodyfont[mathfont,10pt] 4 5 \starttext 6 7 Normal text. 8 9 >> \math{Inline math expression.} 10 11 Normal text. 12 13 \stoptext ? I would appreciate any help or explanations on the topic, or naming a document that explains it. Thanks in advance, bcsikos