Common
Linear temporal logic
Modal temporal logic with modalities referring to time
Linear temporal logic
In logic, linear temporal logic or linear-time temporal logic (LTL) is a modal temporal logic with modalities referring to time. In LTL, one can encode formulae about the future of paths, e.g., a condition will eventually be true, a condition will be true until another fact becomes true, etc. It is a fragment of the more complex CTL*, which additionally allows branching time and quantifiers. LTL is sometimes called propositional temporal logic (PTL). In terms of expressive power, LTL is a fragment of first-order logic. LTL was first proposed for the formal verification of computer programs by Amir Pnueli in 1977.
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