Posted by **Kevin** on Thursday, March 11, 2010 at 11:43am.

Why are finding determinants important?

Aside from Cramer's rule when are determinants used?

- Determinants -
**drwls**, Thursday, March 11, 2010 at 12:06pm
Determinants appear often when you are interested in finding the inverse of an operator that is a square matrix. They also appear in tensor calculus, which is the mathematical form in which the General Theory of Relativity is written.

In my 50 years as an applied physicist, I have sometimes had to read texts and articles that used determinants in derivations, but I have only had to actually calculate them when using Cramer's Rule to solve a system of equations.

Sometimes when doing detailed solutions of fluid mechanics problems with viscosity, tensor calculus is needed.

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