Timeline for Should the formula for the inverse of a 2x2 matrix be obvious?
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Mar 7 at 15:09 | comment | added | Dan Piponi | It's all related. But I was trying to come up with the simplest possible example because that's all you need for a mnemonic. | |
| Mar 7 at 14:46 | comment | added | shreevatsa | Maybe this somehow relates to the seeing the inverse as $A^{-1} = \Delta^{-1}(tI-A)$ in the answer by Noam D. Elkies above? Maybe with an analogy (for $x$ near $1$) with $x^{-1} = (1 - (1-x))^{-1} \approx 1 + (1 - x) = 2 - x$ (or $x^{-1} = (1 + (x-1))^{-1} \approx 1 - (x-1) = 2 - x$)? | |
| Mar 7 at 0:15 | history | edited | Dan Piponi | CC BY-SA 4.0 |
fancy version
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| Mar 6 at 23:58 | history | answered | Dan Piponi | CC BY-SA 4.0 |