Linked Questions

1
vote
0answers
47 views

Solve returns a solution set, but NSolve returns an empty set [duplicate]

I have the following set of equations and paramters (ODE): ...
9
votes
3answers
2k views

Using NSolve in the complex plane

I am trying to find numerical values for $\Im\ e^{\frac{1}{2} +i\ y} = \Im\ \zeta(\frac{1}{2} +i\ y)$ for a given range. I have tried: ...
16
votes
2answers
400 views

Backslide in NSolve in V11.1?

Bug introduced in 11.1.0 and persisting through 11.1.1 In V11.1, NSolve[BesselJ[0, x] == 0 && 0 < x < 20, x] returns no solutions: But in V11.0 (...
4
votes
4answers
1k views

Is there a solution for this equation?

When I try to solve this equation using Mathematica: ...
2
votes
4answers
753 views

Problem in finding the numerical maximum

I need to find the numerical maxima of the function $$i(s)=\bigg[ \frac{\sin{50\pi (\cos s+1)}}{\sin{10\pi (\cos s+1)}} \bigg] ^2$$ Or in the mathematica input form: ...
6
votes
2answers
763 views

NSolve missing solutions in Mathematica 10

Running Mathematica 8.0.4 and 10.0.0 on a Windows 8.1 machine. Processed the same code with both kernels: ...
2
votes
1answer
2k views

why doesn't NSolve find all the solutions that Solve finds?

Define d[p1_, p2_] := (p1 - p2).(p1 - p2) to be the square of the distance between two points. I am trying to solve equations like: ...
4
votes
3answers
292 views

Why the inequality does not take into account the domain?

I have this inequality: Reduce[(4000-1000k)/(k-4) < 0] and the answer is k ∈ Reals I would expect ...
2
votes
1answer
1k views

Solve[Tan[theta] == (b*Sin[t])/(a*Cos[t]), theta] breaks when "Reals" is added?

Mathematica solves this equation fine: Solve[ Tan[theta] == (b*Sin[t])/(a*Cos[t]), theta] // InputForm ...
1
vote
1answer
888 views

NSolve on bounded domain

I don't expect NSolve[] to be able to obtain all solutions in generalfor example. In principle there should be an algorithm that finds all solution to $f(x)=0$ for $...
3
votes
2answers
135 views

What's going on with this system of equations?

The following system of equations has $6$ solutions $(ct=8,8,8,8,7,9)$ but Mathematica doesn't give any solution: ...
0
votes
1answer
348 views

Re[x] vs. x ∈ Reals in the context of Assuming

Let's say that $x$ is some real valued number $>0$. Are the following commands interchangeable in the context of using Assuming? ...