- Details
- See also
- References
- External links
Temporal logic of actions (TLA) is a logic developed by Leslie Lamport, which combines temporal logic with a logic of actions.
It is used to describe behaviours of concurrent systems.
Details
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 today, plus the value of x tomorrow times the value of y today, 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.
See also
- Dynamic logic (modal logic)
- Temporal logic
- PlusCal
- TLA+
References
- {{cite book|last=Lamport|first=Leslie|year=2002|title=Specifying Systems: The TLA+ Language and Tools for Hardware and Software Engineers|publisher=Addison-Wesley|isbn=0-321-14306-X|url=http://research.microsoft.com/users/lamport/tla/book.html|accessdate=2007-02-02}}
- {{citation |url=http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-TN-1994-001.pdf |title=Introduction to TLA |author=Leslie Lamport |date=16 December 1994 |accessdate=2010-09-17}}
External links
- {{Official website|http://research.microsoft.com/users/lamport/tla/tla.html}}
- {{cite web |url= https://tla.msr-inria.inria.fr/tlaps/content/Home.html |title= TLA+ Proof System |publisher= INRIA }}
- {{cite web |first= Leslie |last= Lamport |url= http://channel9.msdn.com/Events/Build/2014/3-642 |title= Thinking for Programmers |quote= A gentle intro to TLA+ at Build |date= 2014}}
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