The woes of the unit circle — a rant by my 15 year old daughterpic.twitter.com/y7UhTxiVp5
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I would contend that this is a good way to gather hypotheses about what would work. I would recommend combing this with a build-test-fix engineering cycle on the proposed materials at various levels of detail.
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This is a sound notion, but it is costly and hard to do. Absent any reason to believe that all the effort and expense might eventually lead to something widely and successfully used, no one bothers to make the attempt. Those who know don't speak, and those who speak don't know.
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It is amazing how many ostensibly modern math textbook tropes can be found in Euler. Here's a random example from Euler's Elements of Algebra:
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"Twenty persons, men and women, dine at a tavern; the share of the reckoning for one man is 8 shillings, for one woman 7 shillings, and the whole reckoning amounts to 7l. 5s. Required the number of men and women separately?"
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