rec-domain1 MathML 2 Recommendation Content/BasicContentElements/domain ../../../Content/BasicContentElements/ident/rec-ident2 ../../../Content/BasicContentElements/codomain/rec-codomain1 $\mathop{\mathrm{domain}}(f)=\mathbb{R}$ <math xmlns="http://www.w3.org/1998/Math/MathML"> <apply> <eq/> <apply> <domain/> <fn> <ci> f </ci> </fn> </apply> <reals/> </apply> </math>