What occurs-check optimizations is SWI Prolog using?...

Unification with STO detection...

Do modern Prolog compilers optimize away the occurs check automatically, when it's safe?...

Does Prolog need GC when the occurs check is globally enabled?...

Why `f(a)=a` fails but `f(X)=X` succeeds in prolog?...

What does Prolog do if you X = f(X)?...

How can Prolog derive nonsense results such as 3 < 2?...

How to enable the occurs check in all unifications in SWI-Prolog?...