Timeline for When exactly and why did matrix multiplication become a part of the undergraduate curriculum?
Current License: CC BY-SA 4.0
8 events
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| Jan 28, 2019 at 8:23 | history | edited | Carlo Beenakker | CC BY-SA 4.0 |
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| Dec 23, 2017 at 10:54 | comment | added | kjetil b halvorsen | Onetime I stmbled over a text "History of determinants" from the 1920's, which consistently talks about "the matrix of a determinant". | |
| Nov 2, 2014 at 19:11 | comment | added | Carlo Beenakker | @FedericoPoloni --- well, the title of this chapter is "Multiplication of Matrices" so this is definitely what the authors wanted to explain, but indeed, they do not differentiate between $AB$, $AB^T$, $A^TB$ and $A^TB^T$, because these matrix products all have the same determinant. So they do not insist that $AB$ is the "proper" way to multiply matrices, as we would do in a course today. | |
| Nov 2, 2014 at 18:26 | comment | added | Vincent Beffara | Well line 2 is the product. | |
| Nov 2, 2014 at 17:41 | comment | added | Federico Poloni | The formula reported in your picture is not $C=AB$ but $C=A^TB$, and the Italian text translates to "The product of two determinants of the same order can be expressed as a single determinant as follows.". So someone with more free time than I have could argue that this is not a matrix product, but simply a composition rule for determinants that happens to be related to it. | |
| Nov 2, 2014 at 11:35 | history | edited | Carlo Beenakker | CC BY-SA 3.0 |
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| Nov 2, 2014 at 11:28 | history | edited | Carlo Beenakker | CC BY-SA 3.0 |
added 475 characters in body
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| Nov 2, 2014 at 8:11 | history | answered | Carlo Beenakker | CC BY-SA 3.0 |