7 votes

Reduce for a difficult case

Let's first check the conditions on the parameters by including the function domain restrictions (implied by specifying Reals) but omitting at first the main ...
user avatar
  • 216k
6 votes
Accepted

Solution at a particular point

Notice you have a syntax problem in your code, the correct way to define your function is like this y[a_, b_, x_] = a^2 b x^-2 (Exp[b/x] - 1)^-1 Now you can ...
user avatar
  • 29.3k
6 votes
Accepted

ContourPlot U^2+W^2=V^2 -> V(U), where U, V solutions of equation from special functions

Use ContourPlot3D for U^2+W^2==V^2 and f[U,V] as ...
user avatar
  • 32.7k
6 votes

How to find integer solution of this equation?

Try FindInstance[(x + y) (5 x + y)^3 + x y^3 == (5 x + y)^3 + x^2 y^3 + x y^4, {x, y}, PositiveIntegers] (* {{x -> 8, y -> 40}} *) Also ...
user avatar
5 votes

How to find integer solution of this equation?

Show, this two solutions are all possible solutions with variable transformation. ...
user avatar
  • 15.7k
4 votes

How to use Solve

I tried to insert the equations in ''Solve'', but I incurred in a syntax problem it looks like you have problem with spaces. t1t2 is not the same as ...
user avatar
  • 109k
3 votes
Accepted

How can I have Mathematica solve the curve equation when nested functions are involved?

You would have to come up with a model in order to fit those curves. No automated system can do that for you. However, that may not be the most useful approach. For instance some properties of the ...
user avatar
  • 60.2k
3 votes
Accepted

Problem with a DAE and DiscreteVariables (II)

It's well known that DAE solver of NDSolve is generally weaker than its ODE solver. (We should admit DAE solving is generally hard than ODE solving, of course. ) So,...
user avatar
  • 52.4k
2 votes

Solution at a particular point

Assuming (1) you really did mean, "I need to find the value of x....", (2) that "marked with a circle" is code for the minimum positive value of ...
user avatar
  • 216k
2 votes
Accepted

Linear ODEs with NDSolve

I have a package for solving eigenvalue boundary value problems using the Compound Matrix Method with the Evans function, which I'll use here. The package is available on my GitHub (which has a ...
user avatar
  • 5,438
2 votes

Problem with a DAE and DiscreteVariables

One can keep differentiating until the DAE turns into an ODE: ...
user avatar
  • 216k
1 vote

Solution at a particular point

We set a,b and the leval set c varying and find the root ...
user avatar
  • 32.7k
1 vote

Solving system of equations including numerical integrals over region

We can solve this problem as optimization problem as follows ...
user avatar
  • 34.1k
1 vote

How to find integer solution of this equation?

Not sure if you can assume y >= x, but that is needed to find your preferred solutions: ...
user avatar
  • 36

Only top scored, non community-wiki answers of a minimum length are eligible