These commands produce roman function names in math mode with proper spacing.
\arccos
\arcsin
\arctan
\arg
\bmod
\cos
\cosh
\cot
\coth
\csc
\deg
\det
\dim
\exp
\gcd
\hom
\inf
\ker
\lg
\lim
\liminf
\limsup
\ln
\log
\max
\min
\pmod
\Pr
\sec
\sin
\sinh
\sup
\tan
\tanh