Temporal logic of actions
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Statements in temporal logic are of the form , where A is an action and t contains a subset of the variables appearing in A. An action is an expression containing primed and non-primed variables, such as . The meaning of the non-primed variables is the variable's value in this state. The meaning of primed variables is the variable's value in the next state. The above expression means the value of x now, plus the value of x tomorrow times the value of y now, equals the value of y tomorrow.
The meaning 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.
Some TLA+ editors include:
- TLA+ Toolbox (an Eclipse IDE for TLA+ tools, including PlusCal translator, TLC model checker and TLA+ Proof System)
- Eclipse TLA+ Plugin
- TLA Editor
- TLA# Plugin for Microsoft Visual Studio 2005
- Lamport, Leslie (2002). Specifying Systems: The TLA+ Language and Tools for Hardware and Software Engineers. Addison-Wesley. ISBN 0-321-14306-X. Retrieved 2007-02-02.
- Leslie Lamport (16 December 1994), Introduction to TLA, retrieved 2010-09-17
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