Completely inaccurate. https://www.ted.com/talks/terry_moore_why_is_x_the_unknown/up-next … the use of x in medieval manuscripts predates Descartes’ use by multiple centuries.
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I would be interested in learning what those specific medieval manuscripts are, if they exist. If Terry Moore has actual evidence, that would be really interesting. Are you aware of any?
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你说得很对。笛卡尔同学写了一本“几何学”,开创了“字母表的开头的小写字母是待定常量,字母表末端的小写字母代表未定变量。关键是,所有的小写字母,都是代数。”这种案例。
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我们看了笛卡尔同学写的“几何学”,这本书在历史上之所以非常重要,今天各国的代数学和几何学的规范,都源自这本书。而且,后来他和费马同学还发现了平面座标几何学。在这种平面座标几何学中,座标轴常常是只画出一根,而不是像今天世界各国中学和大学中的数学和物理教科书,总是把平面座标轴画成两根。
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and is therefore the origin of using 'x' to mean 'unknown' in other contexts, too (X-Files, Planet X, X-factor, etc.)
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Looks like the solution of a quadratic function. The mathematical notation is more modern than the French. One discovers that during those Cartesian times, letter f was quite used , stayed as s in English became varied accents in French see mefme became même.
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That's “ſ”, not “f”. That's how a minuscule “s” was printed unless it was a) the second of a double “s”) or b) the final letter of a word. Hence the German “ß”, which started out as a ligature of “ſs”. https://en.wikipedia.org/wiki/Long_s
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so what?
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Well, it’s a fun fact
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