# Questions tagged [functions]

Questions about the use of built-in Mathematica functions, including pure functions.

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### Recursive functions with integrals/derivatives return wrong results

I have the following recursive functions: ...
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### Multiple Square Bracketed Function definition

I am familiar with the typical way of defining a function--such as f[x_,y_]:=x+y but I have not found a discussion of definitions such as ...
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### Function that Generates all Normal Subgroups of a Group

I am trying to create a function which, given a group structure, generates a list of all the normal subgroups contained within it. But I am not sure how to proceed. For now, I have the following: <...
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### Store a matrix function for a particular value of its argument and use it without calling the function again?

Suppose I have defined a function as: f[x_]:={{x,x^2},{x^3,x}}; g[x_]:=f[x][[1,2]]+f[x][[2,2]]+f[x][[2,1]] Now if I want to calculate ...