# Questions tagged [equation-solving]

Questions on the analytic and numerical equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).

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### NSolve V12.1.1 much slower than V6.0 for the same polynomial system

We are solving polynomial systems with real coefficients using NSolve. A typical system is attached below. The problem we have is that Mathematica V12.1.1 solves it 17 times slower than V6.0, see the ...
1answer
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### Solve not giving a solution for given variables

Solve is not giving me a solution for the following: ...
1answer
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### Running Mathematica in 'SpouseMode'

In this previous question I looked into a deprecated capability of Mathematica from Version 2. Mathematica command that allows it to read my intentions Thanks to all for your answers. I note that ...
1answer
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### How can I solve equations by matching prefactors?

I have complicated expressions involving traces, for example tr[a], tr[a^2], tr[a]^2, ...
0answers
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### NSolve with ParametricFunction

I have solved a SDE with ParametricNDSolve: s = ParametricNDSolve[ {p1, m1, p0, m0}, {P, m}, {r, 0, 1}, {m, k, e, Cnew} ] And now I want to treat the ...
0answers
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### NDSolve gives error with solving given equation [closed]

I need to solve differential equation, but I am not sure what is wrong with it, because Mathematica does not want to solve it and gives me ...