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*From*: Leslie Lamport <tlaplus.ll@xxxxxxxxx>*Date*: Thu, 27 May 2021 15:56:56 -0700 (PDT)*References*: <b36a24e7-f78c-4983-a776-16d56a09fd64n@googlegroups.com> <773cd524-608c-4b8d-8735-aaba45583df6n@googlegroups.com> <a1067e851cd095295bd84c3f7c6b3ab4daa47cc6.camel@gmail.com>

And what do you expect the possible executions of that spec starting with y = 0 to be?

On Thursday, May 27, 2021 at 3:48:40 PM UTC-7 joan...@xxxxxxxxx wrote:

The minimal spec follows.---------------------------- MODULE minimal_ex1 ----------------------------EXTENDS Integers, RealsVARIABLES x, yTypeOK == /\ x \in -128..127/\ y \in -128..127Init == ((x \in -128..127) /\ (y = 0))VS_Pitch_Wheel_Rotation ==y' = ((x' - x + 128) % 256) - 128Next == VS_Pitch_Wheel_RotationSpec == Init /\ [][Next]_<<x,y>>=============================================================================\* Modification History\* Last modified Thu May 27 19:45:21 BRT 2021 by jefferson\* Created Thu May 27 19:45:08 BRT 2021 by jeffersonWhen the model is run, it produces the following error messages:TLC threw an unexpected exception.This was probably caused by an error in the spec or model.See the User Output or TLC Console for clues to what happened.The exception was a java.lang.RuntimeException:In evaluation, the identifier x is either undefined or not an operator.line 11, col 12 to line 11, col 12 of module minimal_ex1The error occurred when TLC was evaluating the nestedexpressions at the following positions:0. Line 11, column 5 to line 11, column 37 in minimal_ex11. Line 11, column 10 to line 11, column 37 in minimal_ex12. Line 11, column 11 to line 11, column 30 in minimal_ex13. Line 11, column 12 to line 11, column 23 in minimal_ex14. Line 11, column 12 to line 11, column 17 in minimal_ex15. Line 11, column 12 to line 11, column 13 in minimal_ex16. Line 11, column 12 to line 11, column 12 in minimal_ex1Thanks for your help.On Thu, 2021-05-27 at 14:35 -0700, Andrew Helwer wrote: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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**Follow-Ups**:

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

**[tlaplus] Re: Doing arithmetic with current state value and next state value of a variable in TLA+***From:*Andrew Helwer

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

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