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Question: Error, (in SolveTools:-CancelInverses) assertion failed, simplify should not leak _Z variables out from RootOfs

Question:Error, (in SolveTools:-CancelInverses) assertion failed, simplify should not leak _Z variables out from RootOfs

nm 10189 Maple 2020
solve rootof
July 08 2020
3

I see this error once in a while

Error, (in SolveTools:-CancelInverses) assertion failed, simplify should not leak _Z variables out from RootOfs 

When I run a long script. Unfortunately, I have not been able to make a small example to reproduce it. So it is random. I've seen it about 5-6 times in the last 2-3 weeks, over 100 runs during this time.

Just wanted to see if anyone saw this before. The strange thing it is random. I can re-run the same script, or restart it from the point where it failed,  with no changes anywhere, and this error do not show up again for days, and suddenly it shows up again.

Must be related how to Maple internal cache memory happened to be arranged at that time. I noticed that a number of things in Maple seem to happen at random times, such as a random hang of the server at different times and places. I could never understand why this happens in Maple.

If there is only one thing Maplesoft could do for the next version, it will be to improve the robustness of its software.


Update March 7, 2024.

FYI, examples giving this error using Maple 2024 using different functions

> 

interface(version);

`Standard Worksheet Interface, Maple 2024.0, Windows 10, March 01 2024 Build ID 1794891`

> 

restart;
> 

kernelopts('assertlevel'=2):
> 

ode:=(exp(x)*sin(y(x))-3*x^2)+(exp(x)*cos(y(x))+y(x)^(-2/3)/3)*diff(y(x),x)=0;
DEtools:-odeadvisor(ode,y(x))

exp(x)*sin(y(x))-3*x^2+(exp(x)*cos(y(x))+(1/3)/y(x)^(2/3))*(diff(y(x), x)) = 0

Error, (in SolveTools:-CancelInverses) assertion failed, simplify should not leak _Z variables out from RootOfs

> 

ode:=diff(y(x),x)*y(x)/(1+1/2*sqrt(1+diff(y(x),x)^2))=-x;
dsolve([ode,y(0)=3],y(x))

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

Error, (in SolveTools:-CancelInverses) assertion failed, simplify should not leak _Z variables out from RootOfs

 

 

Download leak_Z_maple_2024.mw

I have reported this to Mapesoft.

 
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