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TLA+ (Temporal Logic of Actions) is a formal specification language and method designed by Leslie Lamport for modeling systems in the design phase. It helps engineers make sure that the system they're building does what it's supposed to do. TLA+ uses math-like notation for writing precise descriptions of how different parts of a system work together at many levels, from high-level architecture down to detailed algorithms. The language comes with tools that let you simulate how systems will behave under different conditions and check properties through model checking. In addition, its toolkit includes PlusCal, a more human-readable algorithmic language that can automatically be converted into TLA+. This allows software engineers to write sequential or concurrent algorithms in a structured programming style while maintaining the correctness checks provided by the underlying TLA+ logic engine.

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