Hassett, chapter X: « up 1 2 3 4 5 6 7 8 9 10 11 » $ %%%%%%%%%%%%%%%% Helpful KaTeX macros. \gdef\bar#1{\overline{ #1} } \gdef\and{\cap} \gdef\or{\cup} \gdef\set#1{\left\{ #1\right\} } \gdef\mean#1{\left\langle#1\right\rangle} $