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*From*: Andrew Helwer <andrew.helwer@xxxxxxxxx>*Date*: Wed, 18 Jan 2023 07:51:58 -0800 (PST)*References*: <2c52bdc7-3ffa-44f5-8672-368528f6b74bn@googlegroups.com>

Also it seems like monospace fonts are now broken on google groups, anybody else have this problem? Or perhaps it is only mixing monospace and ordinary fonts; I will experiment by making this entire message monospace.

On Wednesday, January 18, 2023 at 10:50:48 AM UTC-5 Andrew Helwer wrote:

Given this spec:---- MODULE Test ----

EXTENDS Naturals

VARIABLE x

Init == x = 10

Next == IF x > 0 THEN x' = x - 1 ELSE UNCHANGED x

Monotonic == []<<x > 0 => x' < x>>_x

====And this model:INIT Init

NEXT Next

PROPERTY MonotonicTLC gives this error:*** Errors: 1

line 6, col 14 to line 6, col 27 of module Test

[] followed by action not of form [A]_v.Does TLC only support [][A]_v, not []<<A>>_v?

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**References**:**[tlaplus] How can I modelcheck an angle-bracket action formula?***From:*Andrew Helwer

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