# Questions tagged [integral-equations]

Questions which deal with or solve for functions expressed in integral form, i.e., one or more unknown functions that appear under an integral sign.

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### Why is my integral evaluating to 0? [closed]

I am trying to write a simple function, then integrate it without bounds. However, it just gives 0 which I know is incorrect.
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### Different results in different versions of Mathematica (computing integrals)

I am working on computing the following integration: aa = N[2, 20] H = 4/160; X = Range[-aa, aa, H]; Integrate[400/(1 + 40*x^2), {x, X[[k]], X[[k + 1]] and ...
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### Integrating Superposition of several sinusoidal waves squared times its derivative

I'm currently finishing some research from a internship I did last summer and part of the project involves calculating the centroids of coronal holes from synoptic maps. If you aren't aware of what ...
I have an integro-differential equation of the form, \small\frac{\partial f(x,t)}{\partial t}=\int_{-5}^5 |x-y|\,f\left(-\frac{x}{3}+\frac{4y}{3},t\right)\,f\left(\frac{2x}{3}+\frac{y}{3},t\right)\,...