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Question: What can cause Physics to be activated when one is not making Physics:- calls explicitly?

Question:What can cause Physics to be activated when one is not making Physics:- calls explicitly?

nm 11693 Maple 2025
diff convert physics
November 24 2025
1

In 2025.2, I found that calling Physics:-Setup causes code of `convert/diff` to change (on the fly) causing error.

I removed from my code the places I was calling Physics:-Setup explicitly, but the error still shows up. Which means there is still places in the code to cause Physics to come into play.

I just installed 2025.2 and have not done anything yet. Just running a test. 

Does one need to install Physics package?

First, let me give an example showing that calling Physics:-Setup changes `convert/diff` which ends up causing an internal Maple error

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.2, Windows 10, November 11 2025 Build ID 1971053`

> 

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.`

> 

Physics:-Version();

`The "Physics Updates" package is not available for the version of Maple under development`

> 

restart;

Original result. No problem

 
> 

print(`convert/diff`);

proc (a, { useeval::truefalse := false }) local ee, zD; ee := `PDEtools/usediff`(a); zD := indets(ee, 'And(function, satisfies(proc (f) options operator, arrow; (op(0, f))::`PDEtools/D/structure` end proc))'); if zD = {} then ee else _Env_t_in_use := `tools/get_symbols`(a); if useeval then zD := map(`convert/diff/D_to_eval@diff`, zD, ':-useEval'); zD := map(proc (u) options operator, arrow; lhs(u) = subsop(0 = eval, rhs(u)) end proc, zD); subs(zD, ee) else subs(map(`convert/diff/D_to_eval@diff`, zD), a) end if end if end proc

> 

T:=D(x)(infinity):

> 

PDEtools:-difforder(convert(T,diff))

1

 

 

 

After call Physics:-Setup

 
> 

restart;

> 

Physics:-Setup('assumingusesAssume' = false):

> 

print(`convert/diff`);

proc () local ans; ans := usepdiff(args); if has([ans], 'D') then ans := Physics:-OriginalValue["convert/diff"](ans, args[2 .. -1]) end if; ans end proc

> 

T:=D(x)(infinity):

> 

PDEtools:-difforder(convert(T,diff))

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

 

 

 

 

Download why_code_changes_calling_Physics_maple_2025_2_nov_24_2025.mw

Notice that now calling PDEtools:-difforder(convert(T,diff))  fail because Physics:- was called.

But my code now has no calls to Physics:-, I made sure to comment all those out. 

But I still get same error when I run my test program. Not able to find where Physics is "activated" again to cause the code change in `convert/diff` that happens dynamically when Physics is loaded.

It must be happining on different call internally. But have no idea why and where.

This is all on new PC. I have no Maple ini files or anything like this that can cause this.

Will installing Physics package explicity fixes this?   

 

Update

I think I know why this happens. Not all fixes made by Edgardo S. Cheb-Terrab in last Physics update are included in Maple 2025.2 !

See https://mapleprimes.com/questions/240843-Why-PDEtoolsSolve-Fail-On-This-Equation  where fix is made in Physics  v.1880 which I confirmed in Maple 2025.1.

But now I checked and this problem is back in Maple 2025.2. which means that fix was not merged into Maple 2025.2. How could this happen?


 

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.2, Windows 10, November 11 2025 Build ID 1971053`

> 

Physics:-Version();

`The "Physics Updates" package is not available for the version of Maple under development`

> 

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.`

> 

restart;
> 

eq:=D(y)(0)+1 = 0;
solve(eq,D(y)(0));

(D(y))(0)+1 = 0

-1

> 

PDEtools:-Solve(eq,D(y)(0));

Error, (in PDEtools:-Solve) required an indication of the solving variables for the given system

> 

 


 

Download fixed_in_2025_1_but_missing_in_2025_2.mw

So I am hoping that figuring how to install Physics update in Maple 2025.2 will fix the current problem with convert and also bring that old fix for PDEtools:-Solve back into Maple 2025.2.

This is something that Maplesoft should have taken care of.

Update 

Figured how install Physics update package V 1881 and doing so fixed this problem in Maple 2025.2 !

This tells me that all fixes that were in Physics update package were not merged into Maple 2025.2

This worksheet shows that now code works OK, but need to make sure to install Physics update package in Maple 2025.2

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.2, Windows 10, November 11 2025 Build ID 1971053`

> 

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.`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1881 and is the same as the version installed in this computer, created 2025, October 7, 16:4 hours Pacific Time.`

> 

restart;

Original result. No problem

 
> 

print(`convert/diff`);

proc (a, { useeval::truefalse := false }) local ee, zD; ee := `PDEtools/usediff`(a); zD := indets(ee, 'And(function, satisfies(proc (f) options operator, arrow; (op(0, f))::`PDEtools/D/structure` end proc))'); if zD = {} then ee else _Env_t_in_use := `tools/get_symbols`(a); if useeval then zD := map(`convert/diff/D_to_eval@diff`, zD, ':-useEval'); zD := map(proc (u) options operator, arrow; lhs(u) = subsop(0 = eval, rhs(u)) end proc, zD); subs(zD, ee) else subs(map(`convert/diff/D_to_eval@diff`, zD), a) end if end if end proc

> 

T:=D(x)(infinity):

> 

PDEtools:-difforder(convert(T,diff))

1

> 

 

> 

 
> 

 

After call Physics:-Setup. now works OK since Physics update is installed

 
> 

restart;

> 

Physics:-Setup('assumingusesAssume' = false):

> 

print(`convert/diff`);

proc () local ans; ans := usepdiff(args); if has([ans], 'D') then ans := Physics:-OriginalValue["convert/diff"](ans, args[2 .. -1]) end if; ans end proc

> 

T:=D(x)(infinity):

> 

PDEtools:-difforder(convert(T,diff))

1

> 

 

> 

 

 

Download why_code_changes_calling_Physics_maple_2025_2_nov_24_2025_V2.mw

 
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