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of is that either A is valid now, or the variables appearing in t do not change. This allows for stuttering steps, in which none of the program variables change their values.

Specification languages

There are multiple specification languages that implement Temporal Logic of Actions. Each language has unique features and use cases:

TLA+

TLA+ is the default and most widely used specification language for TLA. It is a mathematical language designed to describe the behavior of concurrent

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