eq
(eq term1 term2)
The eq function evaluates whether two terms are identical.
The function returns T if the first expression and the second expression are bound to the same object; otherwise, the function returns nil.
: (setq a '(1 2 3))
: (setq b '(1 2 3))
: (setq c b)
: (eq a b)
nil
: (eq b c)
T
equal, =