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 ...
- 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 ...
- 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 ...
- 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 ...
- 37k
5
votes
How to find integer solution of this equation?
Show, this two solutions are all possible solutions with variable transformation.
...
- 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 ...
- 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 ...
- 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,...
- 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 ...
- 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 ...
- 5,438
2
votes
Problem with a DAE and DiscreteVariables
One can keep differentiating until the DAE turns into an ODE:
...
- 216k
1
vote
1
vote
Solving system of equations including numerical integrals over region
We can solve this problem as optimization problem as follows
...
- 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:
...
- 36
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