I quote from the talk page In the image caption of the Minkowski addition and anywhere else only mathematical variables should be italicized For example Q1 Q2 1 3 1 3 should be Q1 Q2 1 3 1 3 I ll check this LaTeX uses different conventions I don t think so Even if it does WP MOSMATH is quite explicit about this see especially the subsubsection Variables Jakob scholbach talk I followed your suggestions I am sorry if I missed any wrongly italicized sets Also I consistently used the WP hypertext formatting and removed all LaTeX for consistency Kiefer Wolfowitz talk Done Kiefer Wolfowitz talk End of quotation