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fermatslibrary's profile
Fermat's Library
Fermat's Library
Fermat's Library
@fermatslibrary

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Fermat's Library

@fermatslibrary

A platform for illuminating academic papers. We publish an annotated paper every week. Our chrome extension for arXiv: https://fermatslibrary.com/librarian 

fermatslibrary.com
Joined September 2015

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    Fermat's Library‏ @fermatslibrary 14 Jun 2018
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    René Descartes is responsible for proposing the use of letters at the end of the alphabet for unknowns and letters at the beginning for known quantitiespic.twitter.com/gomqR2xVS0

    5:50 AM - 14 Jun 2018
    • 1,059 Retweets
    • 4,001 Likes
    • Ariane ♡ David Pavlicek Kcin Antonio Martinez Mirjeta Shabani ıɟnoɥsl∀ ǝpɾɐW Anson Chan Daniel García Valdez missliketrains
    23 replies 1,059 retweets 4,001 likes
      1. drdnylmz 🇹🇷‏ @drdnylmz 14 Jun 2018
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        Replying to @fermatslibrary

        This is not true, it comes from Arabian scientists,they called unknown things as 'şey' , since latins couldn't pronounce it they read as 'kai', then the europians couldnt pronounce this, they read as 'xai', so it becomes x as today known.Precise information!

        0 replies 6 retweets 12 likes
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      1. Alfons Mathieu‏ @AlfonsMathieu 14 Jun 2018
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        Replying to @fermatslibrary

        Why is 'x' the unknown?https://www.ted.com/talks/terry_moore_why_is_x_the_unknown …

        0 replies 3 retweets 4 likes
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      2. mangledPixel‏ @mangledpixel 14 Jun 2018
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        Replying to @fermatslibrary

        Though, as I understand it, it was the printer of La Geometrie that suggested using x, rather than z, as the first unknown, because x was under-used in French text so would stand out as unusual.

        1 reply 0 retweets 24 likes
      3. Jim Christie‏ @jamechristie 14 Jun 2018
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        Replying to @mangledpixel @fermatslibrary

        Yes but more used than english tbh.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Joe May‏ @jamsub6 14 Jun 2018
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        Replying to @fermatslibrary

        Here is a quotation from Descartes that I like: "We ought never to allow ourselves to be persuaded of the truth of anything unless on the evidence of our reason."

        0 replies 2 retweets 2 likes
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      1. Przemek‏ @powczarek 14 Jun 2018
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        Replying to @fermatslibrary

        good idea, it might stick

        0 replies 0 retweets 6 likes
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      1. Romanos Fessas‏ @sonamor 14 Jun 2018
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        Replying to @fermatslibrary

        He also tortured dogs, if I remember correctly. So there's that.

        0 replies 0 retweets 4 likes
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      1. Ann Flynt‏ @AnnFlynt 14 Jun 2018
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        Replying to @fermatslibrary

        I love this. Studied a bit of Descartes in college. Wish I was good at math. But this, even my muddled head can understand!

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      1. Jonathan Brelsford‏ @jbrelsford 14 Jun 2018
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        Replying to @fermatslibrary

        Letters in the middle. #KnownUnknowns

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      2. Harshal S Chhaya‏ @hschhaya 14 Jun 2018
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        Replying to @fermatslibrary

        Cool bit of math history! And the Fortran folks are the reason we use i, j, k as index (counter) variables.

        2 replies 0 retweets 3 likes
      3. Chobbes‏ @Chobbez 14 Jun 2018
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        Replying to @hschhaya @fermatslibrary

        Fairly certain this is a convention from math that predates fortran :).

        1 reply 0 retweets 0 likes
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