Timeline for What is the difference between matrix theory and linear algebra?
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| Apr 4, 2010 at 18:20 | comment | added | Qiaochu Yuan | Covariance matrices are essentially inner products, aren't they? That's just thinking of matrices as tensors of type (0, 2) instead of as tensors of type (1, 1). I think the theory of linear algebra is really good at clarifying the distinction between this type of matrix and the "usual" type of matrix; for example it gets to the heart of when similarity is relevant vs. when conjugation is relevant. So I don't think this is a good example. | |
| Apr 2, 2010 at 2:24 | history | answered | user1855 | CC BY-SA 2.5 |