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Question: internal error (in is/internal) type does not exist

Question:internal error (in is/internal) type does not exist

nm 9934 Maple 2024
solve error
August 06 2024
2

Any idea why calling solve(eqs,unknowns) gives Error, (in is/internal) type does not exist when the unknowns are in a set, but the error goes away when the unknowns are in a list? Is this expected or is this a bug?


 

> 

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 1779 and is the same as the version installed in this computer, created 2024, July 25, 8:56 hours Pacific Time.`

> 

restart;
> 

eqs:={0 = ln(2)+ln(-a*sech(1/2*2^(1/2)*b)^2), 1 = -tanh(1/2*2^(1/2)*b)*a^(1/2)*2^(1/2)};
unknown:={a, b};

{0 = ln(2)+ln(-a*sech((1/2)*2^(1/2)*b)^2), 1 = -tanh((1/2)*2^(1/2)*b)*a^(1/2)*2^(1/2)}

{a, b}

> 

solve(eqs,unknown)

Error, (in is/internal) type `a` does not exist

> 

solve(eqs,unknown)

Error, (in is/internal) type `a` does not exist

> 

restart;
> 

eqs:=[0 = ln(2)+ln(-a*sech(1/2*2^(1/2)*b)^2), 1 = -tanh(1/2*2^(1/2)*b)*a^(1/2)*2^(1/2)];
unknown:={a, b};

[0 = ln(2)+ln(-a*sech((1/2)*2^(1/2)*b)^2), 1 = -tanh((1/2)*2^(1/2)*b)*a^(1/2)*2^(1/2)]

{a, b}

> 

solve(eqs,unknown)

Error, (in is/internal) type `a` does not exist

> 

restart;
> 

eqs:=[0 = ln(2)+ln(-a*sech(1/2*2^(1/2)*b)^2), 1 = -tanh(1/2*2^(1/2)*b)*a^(1/2)*2^(1/2)];
unknown:=[a, b];

[0 = ln(2)+ln(-a*sech((1/2)*2^(1/2)*b)^2), 1 = -tanh((1/2)*2^(1/2)*b)*a^(1/2)*2^(1/2)]

[a, b]

> 

solve(eqs,unknown)

[]

> 

 


 

Download is_internal_error_from_solve_maple_2024_1.mw

Update

Reported to Maplesoft support.

 
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