Re: [tlaplus] Sets with mixed type elements

TLA+ leaves the truth value of formulas such as 1 = "a" or 1 = {} unspecified, and therefore we cannot know if, say,

"a" \in {1, "b"}

holds or not. This explains the error message that TLC produces.

Stephan

On 7 Feb 2020, at 11:45, Leroy van Engelen <leroy.vanengelen@xxxxxxxxx> wrote:

Hi,

It seems that TLC does not support sets of mixed 'types': evaluating `{1, "a"}`, `{1, {}}`, `"a" \in {1}` result in errors like "Attempted to compare string "a" with non-string".

I thought sets would allow any mixed types of elements. Or is this a TLC optimization. I am trying to use to improve on the Json module to support arbitrary inputs, not just sequences.

Regards,

-Leroy van Engelen

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