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[tlaplus] Re: Doing arithmetic with current state value and next state value of a variable in TLA+
- 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: <firstname.lastname@example.org>
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:
I want to write a (piece of a) formula like this:
y' = x' - x
But 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?
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