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Equality. Returns true if x equals y, false if not. Same as Java x.equals(y) except it also works for nil, and compares numbers and collections in a type-independent manner. Clojure's immutable data structures define equals() (and thus =) as a value, not an identity, comparison.
Returns non-nil if nums all have the equivalent value (type-independent), otherwise false
A goal that attempts to unify terms u and v.
A finite domain constraint. u and v must be equal. u and v must eventually be given domains if vars.