Max[$e_1$, $e_2$, ..., $e_i$]Maximum of a series of values:
Max[4, -8, 1]
Max[E - Pi, Pi, E + Pi, 2 E]
Max flattens lists in its arguments:
Max[{1,2},3,{-3,3.5,-Infinity},{{1/2}}]
Max with symbolic arguments remains in symbolic form:
Max[x, y]
Max[5, x, -3, y, 40]
With no arguments, Max gives -Infinity:
Max[]
Max does not compare strings or symbols:
Max[-1.37, 2, "a", b]