Re: [tlaplus] CHOOSEing a function with a unique range for each element of the domain.

[tlaplus-google-group@xxxxxxxxxxx]

https://github.com/tlaplus/CommunityModules/blob/07ef2bc96e2af839318bbd96ae3ef7b80985f5b4/modules/Functions.tla#L42-L49

Markus

> On Feb 21, 2022, at 7:35 PM, thomas...@xxxxxxxxx <thomasgebert@xxxxxxxxx> wrote:
> 
> Hi All, 
> 
> I would like to have a function that has a unique range for each element in the domain (e.g. like an ideal hash function). 
> 
> I was trying to CHOOSE my way into a function: 
> 
> BitString == [1..4 -> {0,1}]
> hash == CHOOSE i \in [0..3 -> BitString] : \A x, y \in 0..3: x /=y /\ i[x] /= i[y]
> 
> But when I try running hash[2] in the evaluator, I get this error: 
> 
> Attempted to compute the value of an expression of form
> CHOOSE x \in S: P, but no element of S satisfied P.
> 
> Anyone have an idea of how I can get my desired effect?

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