What's a good resource for learning about expert systems? I'm curious about this "dead end" but most of what I've found online has been about the ai winter and not the technical details of expert systems.
I have previously built an expert system - a system of codified expert human knowledge built into a system of executable, interrelated rules. Rule engines are the execution engines of expert knowledge in an expert system. The RETE algorithm is another good place to start.
https://en.m.wikipedia.org/wiki/Business_rules_engine https://en.m.wikipedia.org/wiki/Inference_engine https://en.m.wikipedia.org/wiki/Rete_algorithm
When I was first learning, I downloaded and played with CLIPS, a pretty cool old expert system tool built by NASA. https://en.m.wikipedia.org/wiki/CLIPS