eyelog

• A reasoner using webized prolog which basically means that atoms can be IRIs.
• Besides top-down reasoning with conclusion :- premise rules, it also does bottom-up reasoning with conclusion :+ premise rules.
• Bottum-up reasoning can use stable(n) to fail if the deductive closure at level n is not yet stable.
• Proofs steps are step((conclusion :+ premise), premise_inst, conclusion_inst) and conclusion_inst is asserted.
• Variables are interpreted as universally quantified variables except for conclusion :+ premise conclusion-only variables which are interpreted existentially.
• Queries are posed as true :+ premise and answered as answer(premise_inst).
• Inference fuses are defined as false :+ premise and blown as fuse(premise_inst) with return code 2.

Rationale for bottom-up reasoning with conclusion :+ premise rules

• conclusion can be a conjunction
• conclusion can be false to blow an inference fuse
• conclusion can be true to pose a query
• conclusion can not be any other built-in
• conclusion-only variables are existentials
• proving the bottom-up reasoning with step/3 proof steps
• avoiding loops that could occur with top-down reasoning

Installation and test

• Install Trealla Prolog or SWI Prolog or Scryer Prolog

• Install eyelog and run the tests:

  git clone https://github.com/eyereasoner/eyelog
  cd eyelog/etc
  ./test-trealla
  ./test-swipl
  ./test-scryer
  

Background

• Personal notes by Tim Berners-Lee: Design Issues
• Book of Markus Triska: The Power of Prolog

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