Prolog gives error “undefined procedure” when trying to use?

The FAQ says it all: swi-prolog.org/FAQ/ToplevelMode.html.

The FAQ says it all: swi-prolog.org/FAQ/ToplevelMode.html You need to create a file and write your program with rules there. The top level command line will only allow you to issue queries.

Ah I understand now, I assumed it was similar to Python's interactive mode. Thanks! – Ross Mar 23 at 11:35.

Assert(a(A,B):-A=B). True.2? - a(B,c).

B = c.

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