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[tlaplus] Spec formula for Peterson algorithm

Hi there,

I was looking for formal specification on Peterson algorithm and came across this publication (https://lamport.azurewebsites.net/pubs/tlaps.pdf) where it says, I quote:

"The temporal formula Spec is the complete specification. It characterizes behaviors (ω-sequences of states) that start in a state satisfying Init and where every pair of successive states either satisfies Next or else leaves the values of the tuple vars unchanged."

I'm having problem with understanding of tuple vars in specified formula. Can anyone explain to me how these variables (turn, flag and pc) relate to tuple vars? I can understand that some variables stays unchanged during verification, but couldn't get it in final Spec temporal formula.

Best regards,


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