A 1956 AI program for proving math theorems automatically.
Logic Theorist was the kid in math class with the answer already raised. The chalk squeaked once, and it was halfway through the proof.
It searched for proof steps by itself. People used it to prove math theorems.
ATP
Logic Theorist was an early model for proving math theorems by machine.
Symbolic AI
Logic Theorist used symbols, rules, and search to show early Symbolic AI.
Dartmouth Workshop
Logic Theorist showed the promise of machine reasoning at the Dartmouth Workshop.
GPS
GPS kept its idea of breaking problems into searchable steps.