(not= x) (not= x y) (not= x y & more)
Same as (not (= obj1 obj2))
user=> (not= 1 1)
false
user=> (not= 1 2)
true
user=> (not= true true)
false
user=> (not= true false)
true
user=> (not= true true true true)
false
user=> (not= true true false true)
true