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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 May 22
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    No century begins with a Tuesday, Thursday, or Sunday Proof: In 400 years there are 97 leap and 303 non-leap: 400x365+97=146097 days, which is divisible by 7 - everything repeats after 400 years (G.C.)! Since 1/1/2000-Saturday 1/1/2100-Friday 1/1/2200-Wednesday 1/1/2300-Mondaypic.twitter.com/f6pVDu39EH

    6:53 AM - 22 May 2020
    • 760 Retweets
    • 2,864 Likes
    • Mohammad Akeel Victor Bernal nothingman LiridonR Edy Enrique Caballero http://ug.k/~ghostface/~the.bronze.horseman Theo Kontogiannis Mickey D.
    25 replies 760 retweets 2,864 likes
      1. Milehigh 08‏ @milehigh08 May 22
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        Replying to @fermatslibrary

        But centuries end on the 00 year and start on the 01 years. No century begins with a Sunday, Wednesday, or Friday. 1/1/2001-Monday 1/1/2101-Saturday 1/1/2201-Thursday 1/1/2301-Tuesday

        0 replies 5 retweets 16 likes
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      1. Cantor’s Paradise‏ @Cantor_Paradise May 22
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        Replying to @fermatslibrary

        https://link.medium.com/oDdWQV3fH6 

        0 replies 3 retweets 13 likes
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      1. New conversation
      2. Susam Pal‏ @susam May 22
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        Replying to @fermatslibrary

        An algorithm devised by John Conway known as the doomsday rule can be used to mentally compute the day of the week for a given date. It relies on the fact that the last day of Feb, 4/4, 6/6, 8/8, 10/10, and 12/12 fall on the same day of the week (called the doomsday) in any year.

        1 reply 4 retweets 30 likes
      3. william o'tule‏ @willyOTule May 25
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        Replying to @susam @fermatslibrary

        great, can you point to it?

        1 reply 0 retweets 0 likes
      4. 1 more reply
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      2. Armchair Revolutionary‏ @bayanda May 22
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        Replying to @fermatslibrary

        Doesn't the 21st century begin on 1/1/2001? I thought 2000 was the last year of the 20th century not the beginning of the new one.

        2 replies 0 retweets 6 likes
      3. 禮‏ @Vestige_du_jour May 22
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        Replying to @bayanda @fermatslibrary

        Still controversial when the 3rd millennium started, New Year in 2000 or 2001. The logic to take 2001 is that "year 0" did not exist. In any case above observation is correct. Gregorian calendar, rotations are 2000: Sat-Fri-Wed-Mon 2001: Mon-Sat-Thu-Tue https://www.timeanddate.com/counters/mil2000.html …

        1 reply 0 retweets 3 likes
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      2. m͢a͢í͢r͢a͢ ͢k͢ ͢a͢n͢s͢a͢d͢a͢ ͢d͢i͢s͢s͢o͢ ͢t͢u͢d͢o͢‏ @mairak May 22
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        Replying to @fermatslibrary

        That's wrong! The century begins in 01, not 00.

        2 replies 0 retweets 18 likes
      3. Harthacnut_the_Great‏ @HarthacnutG May 23
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        Replying to @mairak @fermatslibrary

        No, that's right it starts right after 11:59.99, of the century that's about to finish.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Lluís Teixidó  🎗 🌹 📚‏ @lluisteixido May 22
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        Replying to @fermatslibrary

        But didn't we agree that the century started on 1/1/2001? Or it's not the case?

        0 replies 0 retweets 7 likes
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      1. Roger Sauer‏ @rsauer3473 May 22
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        Replying to @fermatslibrary

        Not only that, but most centuries start without most people wearing pants!

        0 replies 0 retweets 6 likes
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