The max command returns the largest value among the passed arguments.

$\mathrm{MapleTA}:-\mathrm{Builtin}:-\max \left(3\,5\,7\,4.8\,-1\right)$

$7$

The MapleTA[Builtin][max] command was introduced in Maple 18.

For more information on Maple 18 changes, see Updates in Maple 18.