[Merged by Bors] - feat: add some regularity results for multivariable polynomials #6541
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The goal (which is achieved) is to make things like this work:
```lean
example {s : Finset σ} {n : σ} {k : ℕ} {p : MvPolynomial σ R} :
p * (∏ n in s, X n) * X n ^ k = 0 ↔ p = 0 := by
simp
```
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The goal (which is achieved) is to make things like this work:
```lean
example {s : Finset σ} {n : σ} {k : ℕ} {p : MvPolynomial σ R} :
p * (∏ n in s, X n) * X n ^ k = 0 ↔ p = 0 := by
simp
```
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Aug 17, 2023
The goal (which is achieved) is to make things like this work:
```lean
example {s : Finset σ} {n : σ} {k : ℕ} {p : MvPolynomial σ R} :
p * (∏ n in s, X n) * X n ^ k = 0 ↔ p = 0 := by
simp
```
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The goal (which is achieved) is to make things like this work:
We may (or may not) wish to rename the file
Algebra.Regular.Pow.Intended to help with #6139