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EricLengyel

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How many people were taught that the formulas for the dot product (x₁x₂ + y₁y₂ + z₁z₂) and cross product (y₁z₂ − y₂z₁, z₁x₂ − z₂x₁, x₁y₂ − x₂y₁) are simply definitions and cannot be derived?

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@EricLengyel When I was young my dad taught me to read multiplication as “of”.

@EricLengyel When I was young my dad taught me to read multiplication as “of”.

Properties5
typearchive
sourcetwitter
date2020-02-17
tagsarchive, twitter, ericlengyel
description@EricLengyel When I was young my dad taught me to read multiplication as “of”.

Feb 17, 20201 min read

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  • URL: https://x.com/82unpluggd/status/1229337343234015233
  • Author: Jacob Foshee (@82unpluggd)
  • Posted: 2020-02-17 09:30:37

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1/ @82unpluggd

@EricLengyel

When I was young my dad taught me to read multiplication as “of”. When I teach the Lin Alg basics for graphics math it all starts there. “Of” is a projection.

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  • How many people were taught that the formulas for the dot product (x₁x₂ + y₁y₂ + z₁z₂) and cross product (y₁z₂ − y₂z₁, z₁x₂ − z₂x₁, x₁y₂ − x₂y₁) are simply definitions and cannot be derived?

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