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Question: Error, (in odetest/series) when calling 'MultiSeries:-multiseries'. Received: 'unable to sort exponents,

Question:Error, (in odetest/series) when calling 'MultiSeries:-multiseries'. Received: 'unable to sort exponents,

nm 9934 Maple 2024
ode series differential-equations odetest
September 14 2024
1

Is this new error in Maple? I do not have older versions to check.

Solved this ode as series. When calling odetest on it, it gives this error as shown in worksheet below.

Maple 2024.1.

Any work arounds?
 

> 

interface(version);

`Standard Worksheet Interface, Maple 2024.1, Windows 10, June 25 2024 Build ID 1835466`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1805 and is the same as the version installed in this computer, created 2024, September 3, 11:35 hours Pacific Time.`

> 

libname;

"C:\Users\Owner\maple\toolbox\2024\Physics Updates\lib", "C:\Program Files\Maple 2024\lib"

> 

restart;
> 

ode:=-(A/( (1-x)*x^4) - B/( x^4*(1-x)^2)+C/( (1-x)*x^2))*y(x)+1/(1-x)*diff(y(x),x)+diff(y(x),x$2)=0;

-(A/((1-x)*x^4)-B/(x^4*(1-x)^2)+C/((1-x)*x^2))*y(x)+(diff(y(x), x))/(1-x)+diff(diff(y(x), x), x) = 0

> 

Order:=3;
maple_sol:=dsolve(ode,y(x),'series','point'=1);

3

y(x) = c__1*(x-1)^(1-(1-B)^(1/2))*(series(1-((-4*B+A+C)/((1-(1-B)^(1/2))^2+B-1))*(x-1)+((4*A*(1-(1-B)^(1/2))^2-10*B*(1-(1-B)^(1/2))^2+2*C*(1-(1-B)^(1/2))^2+A^2-4*B*A+2*A*C+6*B^2-6*B*C+C^2-4*A+10*B-2*C)/(((1-(1-B)^(1/2))^2+B-1)*((1-(1-B)^(1/2))^2+B+2-2*(1-B)^(1/2))))*(x-1)^2+O((x-1)^3),x = 1,3))+c__2*(x-1)^(1+(1-B)^(1/2))*(series(1-((-4*B+A+C)/((1+(1-B)^(1/2))^2+B-1))*(x-1)+((4*A*(1+(1-B)^(1/2))^2-10*B*(1+(1-B)^(1/2))^2+2*C*(1+(1-B)^(1/2))^2+A^2-4*B*A+2*A*C+6*B^2-6*B*C+C^2-4*A+10*B-2*C)/(((1+(1-B)^(1/2))^2+B-1)*((1+(1-B)^(1/2))^2+B+2+2*(1-B)^(1/2))))*(x-1)^2+O((x-1)^3),x = 1,3))

> 

odetest(maple_sol,ode,'series','point'=1)

Error, (in odetest/series) when calling 'MultiSeries:-multiseries'. Received: 'unable to sort exponents, {(1-B)^(1/2), -(1-B)^(1/2), 1-(1-B)^(1/2), 1+(1-B)^(1/2), 2-(1-B)^(1/2), 2+(1-B)^(1/2), 3-(1-B)^(1/2), 3+(1-B)^(1/2), 4-(1-B)^(1/2), 4+(1-B)^(1/2)}, MultiSeries:-multiseries'

> 

 


 

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