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*From*: Karolis Petrauskas <k.petrauskas@xxxxxxxxx>*Date*: Sat, 17 Jul 2021 11:21:40 +0300*Ironport-hdrordr*: A9a23:oOoSmqwt/tMOroG8y+3sKrPwS71zdoMgy1knxilNoHtuE/Bw9vrBoB11726WtN98YgBDpTniAsa9qA3nlaKdiLN5VdzJYOCMggeVxe9ZgLff/w==*References*: <b919c7af-ddf1-4960-bb38-9759a0a9b477n@googlegroups.com>

At least in my understanding the distinction is that a temporal formula defines a behaviour, and the action only a relation between two states.

I find the TLA paper very useful and complementary to the book as well: https://lamport.azurewebsites.net/pubs/lamport-actions.pdf.

In sections 3 and 4 the actions are considered as elementary temporal formulas.

Karolis

Chapter 8 of “Specifying Systems” often makes a distinction between an action and a temporal formula, but I’m having trouble finding any definitions earlier the book that tell me what the difference is. Is it this?: actions are ordinary formulas with primed variables and/or ENABLED, and temporal formulas also permit [] and <>. --

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