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Expressiveness

Propositional logic: 0th order logic

Limitations

‘Harry is sick’ or ‘sick’ can be handled, but not ‘x is sick’.

First order predicate logic

Propositional logic with predicates, quantifiers. See Propositional logic section: many properties carry over.

Limitations

Can’t talk about relations over relations. Eg: G(R(x,y),z).

Fuzzy logic

Could be 0.7 correct: not just correct or incorrect.

Temporal logic

Entailment. Also see co operator in distributed computing ref.