# Re: [tlaplus] VIEW for Structure variable

Hunnn, thanks, Markus o/

Everyday is day to learn something about TLC.

On Thu, Jun 10, 2021, 1:32 AM Markus Kuppe <tlaplus-google-group@xxxxxxxxxxx> wrote:

On 09.06.21 21:04, pfeod...@xxxxxxxxx wrote:
>
> In TLC, we have the VIEW config where you choose which variables are
> important and which are auxiliary.
>
> Let's say I have a variable Var of interest which is always a
> Structure, would it be too hard to do something like VIEW but where
> you say that, for this Var, TLC does not consider some keys for
> fingerprint (kinda like auxiliary keys)?

A VIEW *is a state function* (page 243 in Specifying Systems). In other
words, any state-level^1 (unprimed) _expression_ can be a view, such as
<<[n \in SomeSubsetOfDOMAIN Var |-> Var[n], other, variables>>

Don't shoot yourself in the foot!

Markus

^1 TLC will keep you from defining a constant-level _expression_.

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