## Determinants over commutative rings [closed]

Hello, I am preparing a paper on determinants in commutative rings. Someone can give me examples of applications of determinants in commutative rings to other areas of mathematics or physics. Thank you

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 This seems a bit of an unspecific request. What type of paper? Original research, a survey, or something for a course, say? In addition, do you want applications where the ring is actually not a field, or more narrowly not the reals or complex numbers. Or would applciations for them also be fine; they are comm rings after all. – quid Mar 3 2012 at 23:58 The paper is on the convertion the determinant into the permanent. Yes i want applications where the ring has zero divisors. – Miguel Mar 4 2012 at 0:17

## closed as off topic by Steven Landsburg, quid, Karl Schwede, Mariano Suárez-Alvarez, Anthony QuasMar 4 2012 at 2:42

Would this be an example of what you are looking for?

Definition. We say that an element $f$ of a local ring $R$ is a determinant if $f$ is the determinant of some $n\times n$ matrix, $n\geq2$ with entries in the maximal ideal of $R$.

Theorem (Eisenbud). Let $R$ be a $3$-dimensional regular local ring, and let $f\in R$ be a prime element. Then the quotient ring $R/(f)$ is factorial if and only if $f$ is not a determinant in $R$.

Reference.

The previous theorem can be found on page 124 of:

Eisenbud, D.: Recent progress in commutative algebra, Algebraic geometry - Arcata 1974, AMS Proc. of Pure Math. XXIX (1975), 111-128.

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