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I would say Expert Systems is still being taught. For instance, if you look at some of the open courses like MIT's, there are still lectures on it. Also, looking at the CLIPS documentation, you will find a couple of examples of usage from 2005. What I suspect is that Expert Systems are now embedded with "normal systems" in practice. Hence it may be ...


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Rule-based systems cover a wide range of systems. Some make use of boolean if/then/else rules, others may use weighting or even probabilistic inference. Some operate on frames, some on java objects, some on propositions that can be formulated in predicate logic. An example of a popular rule system is Drools. Some rule systems can be expressed as a subset of ...


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A recent research example is the "Grind" system. Take a look at the paper Computing FO-Rewritings in $\mathcal{E} \mathcal{L}$ in Practice: from Atomic to Conjunctive Queries (2018) by Peter Hansen and Carsten Lutz. Here's the abstract. A prominent approach to implementing ontology-mediated queries (OMQs) is to rewrite into a first-order query, ...


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Are there companies that still use expert systems? There are still some expert system inference engines available in open source form, in particular CLIPS rules A specialization of your question could be: what companies are using CLIPS in 2020 ? I don't have any ideas, even if I did try in https://github.com/bstarynk/clips-rules-gcc And the RefPerSys ...


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