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Question: Is this new error in dsolve 2025.2? Error, (in dsolve) improper op or subscript selector

Question:Is this new error in dsolve 2025.2? Error, (in dsolve) improper op or subscript selector

nm 11563 Maple 2025
dsolve error
47 minutes ago
0

Could someone please check if Maple 2025.1 gives this error?  I only have Maple 2025.2 (is there a way to install Maple 2025.1 on same PC, after installing Maple 2025.2? Will Maple complain or remove Maple 2025.2 if I do this? Can I use same activation key to do this? I only have one.

Will call support and ask them on monday. This way I can check myself from now on.

Calling dsolve on an ode gives Error, (in dsolve) improper op or subscript selector which comes from 

             Computing canonical coordinates for the symmetry [x*(x^2+y^2+a), -y*(-x^2-y^2+a)]

Worksheet below. 

> 

restart;
> 

interface(version);

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

> 

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.`

> 

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.`

> 

libname;

"C:\Users\me\maple\toolbox\2025\Physics Updates\lib", "C:\Users\me\maple\toolbox\2025\Maple Customer Support Updates\lib", "C:\Program Files\Maple 2025\lib"

> 

ode:=x*y(x)*diff(y(x),x)^2+(a+x^2-y(x)^2)*diff(y(x),x)-y(x)*x = 0;

x*y(x)*(diff(y(x), x))^2+(a+x^2-y(x)^2)*(diff(y(x), x))-y(x)*x = 0

> 

dsolve(ode);

Error, (in dsolve) improper op or subscript selector

> 

infolevel[dsolve]:=5;

5

> 

dsolve(ode);

Methods for first order ODEs:

   *** Sublevel 2 ***

   Methods for first order ODEs:

   -> Solving 1st order ODE of high degree, 1st attempt

   trying 1st order WeierstrassP solution for high degree ODE

   trying 1st order WeierstrassPPrime solution for high degree ODE

   trying 1st order JacobiSN solution for high degree ODE

   trying 1st order ODE linearizable_by_differentiation

   trying differential order: 1; missing variables

   trying simple symmetries for implicit equations

   Successful isolation of dy/dx: 2 solutions were found. Trying to solve each resulting ODE.

      *** Sublevel 3 ***

      Methods for first order ODEs:

      --- Trying classification methods ---

      trying homogeneous types:

      trying exact

      Looking for potential symmetries

      trying an equivalence to an Abel ODE

      trying 1st order ODE linearizable_by_differentiation

   -> Solving 1st order ODE of high degree, Lie methods, 1st trial

    -> Computing symmetries using: way = 3

[x^3+x*y^2+a*x, x^2*y+y^3-a*y]

    <- successful computation of symmetries.

 1st order, trying reduction of order with given symmetries:

[x*(x^2+y^2+a), -y*(-x^2-y^2+a)]

   1st order, trying the canonical coordinates of the invariance group

   -> Computing canonical coordinates for the symmetry [x*(x^2+y^2+a), -y*(-x^2-y^2+a)]

Error, (in dsolve) improper op or subscript selector

> 

 

 

Download dsolve_gives_parsing_error_maple_2025_2_nov_20_2025.mw

This internal error happens even if Physics or Support tools are not in libname.

 
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