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My publisher: 😭 noooo you can't put linear algebra in your #DoTheMathBook! Us: Hear us out though... Emojis... 😎 My publisher: @LongFormMath/1466206720020021252
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Btw this reminds me I really need to run a mathematical puzzle design course - solving these doesn't require much work, but I did use linear algebra to guarantee uniqueness without having to check things by hand when designing them.