Major Section: PROGRAMMING
(/= x y) is logically equivalent to (not (equal x y)).
Unlike equal , /= has a guard requiring both of its arguments
to be numbers. Generally, /= is executed more efficiently than
a combination of not and equal .
For a discussion of the various ways to test against 0, See zero-test-idioms.
/= is a Common Lisp function. See any Common Lisp documentation
for more information.