, and are LTL formulas.

X is read as next and U is read as until.Other than these fundamental operators, there are additional logical and temporal operators defined in terms of the fundamental operators, in order to write LTL formulas succinctly.The additional logical operators are ?, ->, <->, true, and false.Following are the additional temporal operators.

* G for always (globally)
* F for finally
* R for release
* W for

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