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[tlaplus] Re: About Action
- From: Andrew Helwer <andrew.helwer@xxxxxxxxx>
- Date: Thu, 22 Apr 2021 06:37:59 -0700 (PDT)
- Ironport-hdrordr: A9a23:x7mYYKnsmmbe2En7FiRJFEgIKYTpDfLk3DAbvn1ZSRFFG/GwvcaogfgdyFvImC8cMUtQ+uyoFaGcTRrnhPtIyKYLO7PKZmfbkU+JCK0n0of42T3nHETFltJ18at7aaBxBJnRADFB/KTHyTK1Gdoh39WLmZrA7Yy1815XQRhue+Vc6W5CazqzKFF8RwVNGPMCeKa028wvnVedUEVSSsy6A3UfNtKtm+H2
- References: <firstname.lastname@example.org>
The formula x' + 1 = y + z is syntactically valid and can be used in an action property
, but if you want to use TLC it cannot be used in an action itself. See Specifying Systems p238 for the expressions TLC can handle when computing successor states; they include expressions of the form:
- x' = e
- x' \in S
- UNCHANGED x
On Wednesday, April 21, 2021 at 11:48:27 PM UTC-4 hua...@xxxxxxxxx wrote:
For an TLA's action, which is essentially a boolean _expression_, does it ONLY relate to two variables(primed or non-primed)?
For instance, x' + 1 =y. (Please refer to Section 2.3 in Lamport's seminal paper "The Temporal Logic of Actions"-ACM 1993).
Can we have an x' + 1 = y+z as an action? If yes, how we define the "old state" and the new state with the postfix notation? maybe define a super-state to cover (y, z)?
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