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Question: simplify((D@@2)(y)(Pi) = 0) fail when adding Physics:-Setup(assumingusesAssume = true)

Question:simplify((D@@2)(y)(Pi) = 0) fail when adding Physics:-Setup(assumingusesAssume = true)

nm 11443 Maple 2025
simplify diff physics
2 hours ago
1

Another very serious bug in Maple.

I have code that simplifies intitial conditions passed.

I found that simplify((D@@2)(y)(Pi) = 0) gives error 

Error, (in unknown) invalid input: diff received Pi, which is not valid for its 2nd argument

but Pi is constant. It works for any other values other than Pi.

This only happens when adding Physics:-Setup(assumingusesAssume = true):

Any idea why this happens?

> 

restart;
> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1877 and is the same as the version installed in this computer, created 2025, July 11, 19:24 hours Pacific Time.`

> 

SupportTools:-Version();

`The Customer Support Updates version in the MapleCloud is 29 and is the same as the version installed in this computer, created June 23, 2025, 10:25 hours Eastern Time.`

> 

simplify((D@@2)(y)(Pi) = 0)

((D@@2)(y))(Pi) = 0

> 

Physics:-Setup(assumingusesAssume = true):
> 

simplify((D@@2)(y)(Pi) = 0)

Error, (in unknown) invalid input: diff received Pi, which is not valid for its 2nd argument

 

 

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