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*From*: Andrew Helwer <andrew.helwer@xxxxxxxxx>*Date*: Thu, 27 May 2021 14:35:20 -0700 (PDT)*Ironport-hdrordr*: A9a23:bsFvyayOUJ42Xvs6aTGwKrPw7L1zdoMgy1knxilNoH1uA7OlfqWV98jzuiWYtN8uYgBEpTn+Atj6fZqxz+8X3WBVB8baYODNghrPEGga1/qE/9SCIVyDygc+79YQT0EWMrSZMbE5t7eD3OCFKadD/DDuysCVbIzloEuFIzsHV0hI1XYFNu7yencGPjWvePACZeShD2R8zQZJEBwsH6CG7wE+PtQr3OekqK7b*References*: <b36a24e7-f78c-4983-a776-16d56a09fd64n@googlegroups.com>

Can you post a minimal functional spec which reproduces this error?

On Thursday, May 27, 2021 at 4:11:15 PM UTC-4 joan...@xxxxxxxxx wrote:

Hello,I want to write a (piece of a) formula like this:

y' = x' - xBut every time I try to run the model I get the error, «In evaluation, the identifier x is either undefined or not an operator.»

What is going on? Is it really not possible to write such formulas? why? How can I work around this?

Thanks.

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**References**:**[tlaplus] Doing arithmetic with current state value and next state value of a variable in TLA+***From:*Jefferson Andrade

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