## UNION-EQ

union of two lists of symbols
Major Section: PROGRAMMING

`(Union-eq x y)`

equals a list whose members (see member-eq) contains the
members of `x`

and the members of `y`

. More precisely, the resulting
list is the same as one would get by first deleting the members of `y`

from
`x`

, and then concatenating the result to the front of `y`

.

The guard for `union-eq`

requires both arguments to be true lists and
at least one to be a true list of symbols, as the function `member-eq`

is
used to test membership (with `eq`

). See union-equal.