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Is Matrix Multiplication Ugly?

(mathenchant.wordpress.com)
34 points jamespropp | 1 comments | 21 Nov 25 22:17 UTC | HN request time: 0s | source
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jamespropp ◴[21 Nov 25 22:21 UTC] No.46009709[source]▶
Do you disagree with my take or think I’m missing Witt’s point? I’d be happy to hear from people who disagree with me.
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veqq ◴[22 Nov 25 00:18 UTC] No.46010720[source]▶
> sends the pair (x, y) to the pair (−x, y)

I know linear algebra, but this part seems profoundly unclear. What does "send" mean? Following with different examples in 2 by 2 notation only makes it worse. It seems like you're changing referents constantly.

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1. jamespropp ◴[22 Nov 25 00:24 UTC] No.46010763[source]▶
Thanks for pointing this out. I’ll work on this passage tomorrow.