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Question: why Maple 2025 hangs on this separable ode?

Question:why Maple 2025 hangs on this separable ode?

nm 11218 Maple 2025
ode dsolve differential-equations
April 20 2025
2

This looks like regression in dsolve.

In Maple 2024.2, dsolve solves this with no problem and very quickly. 

In Maple 2025 it just hangs.

Any one could find why this is the case? infolevel does not show why. Below is Maple 2024.2 worksheet and Maple 2025 worksheet.  This is Maple 2024.2 NO HANG

> 

interface(version);

`Standard Worksheet Interface, Maple 2024.2, Windows 10, October 29 2024 Build ID 1872373`

> 

ode:=diff(y(x),x)+((y(x)+1)*(y(x)-1)*(y(x)-2))/(x+1)=0;
IC:=y(1)=0;

diff(y(x), x)+(y(x)+1)*(y(x)-1)*(y(x)-2)/(x+1) = 0

y(1) = 0

> 

DEtools:-odeadvisor(ode);

[_separable]

> 

infolevel[dsolve]:=5;
dsolve([ode,IC])

5

 -> Computing symmetries using: way = 3

Methods for first order ODEs:

--- Trying classification methods ---

trying a quadrature

trying 1st order linear

trying Bernoulli

trying separable

<- separable successful

y(x) = RootOf(-2048+(x^6+6*x^5+15*x^4+20*x^3+15*x^2+6*x+257)*_Z^18+(-6*x^6-36*x^5-90*x^4-120*x^3-90*x^2-36*x-1542)*_Z^12+(9*x^6+54*x^5+135*x^4+180*x^3+135*x^2+54*x+3081)*_Z^6)^6-1

 

 

Download dsolve_2024_no_hang_april_20_2025.mw

This is Maple 2025. HANGed. Had to terminate it after 15 minutes. It seems to hang on resolving initial conditions. 

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.0, Linux, March 24 2025 Build ID 1909157`

> 

ode:=diff(y(x),x)+((y(x)+1)*(y(x)-1)*(y(x)-2))/(x+1)=0;
IC:=y(1)=0;

diff(y(x), x)+(y(x)+1)*(y(x)-1)*(y(x)-2)/(x+1) = 0

y(1) = 0

> 

DEtools:-odeadvisor(ode);

[_separable]

> 

infolevel[dsolve]:=5;
dsolve([ode,IC])

5

 -> Computing symmetries using: way = 3

Methods for first order ODEs:

--- Trying classification methods ---

trying a quadrature

trying 1st order linear

trying Bernoulli

trying separable

<- separable successful

 

 

Download dsolve_2025_on_linux_hangs_april_20_2025.mw
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