Prolog - Checking if a binary tree is ordered or not...

handle error in prolog...

Prolog - Exercise on facts and lists...

Prolog - Little exercise on facts...

Counting all of the even integers within a b-tree in Prolog...

Can I keep track of value I'm getting in an other variable while working in a recursion?...

Visual Prolog - Maze Problem...

Basic Library System in Prolog...