Major Section: ACL2-BUILT-INS
General Forms: (remove x lst) (remove x lst :test 'eql) ; same as above (eql as equality test) (remove x lst :test 'eq) ; same, but eq is equality test (remove x lst :test 'equal) ; same, but equal is equality test
(Remove x lst) is equal to lst if x is not a member of lst,
else is the result of removing all occurrences of x from lst. The
optional keyword, :TEST, has no effect logically, but provides the
test (default eql) used for comparing x with successive elements of
lst.
Also see remove1.
The guard for a call of remove depends on the test. In all cases,
the second argument must satisfy true-listp. If the test is eql,
then either the first argument must be suitable for eql (see eqlablep)
or the second argument must satisfy eqlable-listp. If the test is
eq, then either the first argument must be a symbol or the second
argument must satisfy symbol-listp.
See equality-variants for a discussion of the relation between remove and
its variants:
(remove-eq x lst)is equivalent to(remove x lst :test 'eq);
(remove-equal x lst)is equivalent to(remove x lst :test 'equal).
In particular, reasoning about any of these primitives reduces to reasoning
about the function remove-equal.
Remove is defined by Common Lisp. See any Common Lisp documentation for
more information.
