[tlaplus] Q about ASSUME

[n s <nedsri1988@xxxxxxxxx>]

Hello, perhaps I'm too steeped in PL ideas of well-typed programs to see it, but I am still not sure I've completely grasped why ASSUME can't be applied to variables. For example if N is a constant and  I have the assumption ASSUME N \in Nat /\ N > 0 then I'm saying that my specification is limited to those traces in which the constant N can only be a Nat greater than 0. Specifically I am excluding states in which N violates this constraint. Why can't I say the same thing about a variable n instead of a constant N? Namely that I am limiting my specification to those traces in which n is a Nat greater than 0.

thanks

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