Major Section: PROGRAMMING
(Lower-case-p x) is true if and only if x is a lower case
character, i.e., a member of the list #A, #B, ..., #Z.
The guard for lower-case-p requires its argument to be a standard
character (see standard-char-p).
Lower-case-p is a Common Lisp function. See any Common Lisp
documentation for more information.