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I have compiled this list of **100 new theorems to prove using mathlib4**. Some of these (like the Feit–Thompson theorem) have already been proved in other proof assistants, but that is largely irrele…
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I was talking to @dlfivefifty over at `ApproxFun.jl` where they have an implementation of the hermite transform using gausshermite quadrature. While this is clearly a reliable choice, is there any sco…
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The following seems natural to me but doesn't work:
```
V=VectorSpace(QQ,3)
A=matrix(QQ,3,3,[0,1,-1, 1,0,-1, 0,0,-1])
gen(V,1)*A
```
Let's be able to actually act on V!
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Boost.uBLAS can calculate the determinant of (at most) 2x2 matrices. I have a piece of code that can do this for any matrix size (which is http://www.richelbilderbeek.nl/CppUblasMatrixExample7.htm), t…
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As [has been noted](https://github.com/JuliaML/LIBSVM.jl/pull/88#issuecomment-966320382) by @barucden in #88, SVMs with user-defined/callable kernels are generally not (de-)serializable. Since the iss…
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This code
```
from sympy import *
minpoly(root(2,3)+root(3,3)+(-1+I*sqrt(3))/2*root(5,3))
```
doesn't terminate.
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Is it currently possible to build a sparse design matrix from a formula? This is desirable for formulas with lot of categorical variables and their interactions, which are naturally represented as a s…
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Matrix exponentiation is a costly operation. See [1][Nineteen Dubious Ways to Compute the Exponential of a Matrix, Twenty-Five Years Later∗](https://www.cs.cornell.edu/cv/ResearchPDF/19ways%2B.pdf).
…
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Currently, [`is_invertible_with_inverse`](https://docs.oscar-system.org/dev/AbstractAlgebra/matrix/#is_invertible_with_inverse-Union{Tuple{MatrixElem{T}},%20Tuple{T}}%20where%20T%3C:RingElement) can g…
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In order to support e.g. interpolation in more general rings, we need to be able to have and test more ring and elem properties, both mathematically and functionally:
Rings: (ignore the names)
-is…