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macrocephalopod's profile
macrocephalopod
macrocephalopod
macrocephalopod
@macrocephalopod

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macrocephalopod

@macrocephalopod

Paul Allen, Vice President M&A, Pierce & Pierce (Sie/Hir) | Vegan | Silence is Violence | Women’s Rights Are Human Rights | ACAB (Assigned Cephalopod At Birth)

Joined December 2020

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    1. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @C_Trombley1

      That would predate the 20th century then. Let me see if I can find such uses by him to confirm what you believe.

      1 reply 0 retweets 3 likes
    2. C Trombley‏ @C_Trombley1 2 Dec 2021
      Replying to @RadishHarmers

      Gibbs & Wilson uses r theta phi without comment so 1901 is an upper limit

      1 reply 0 retweets 5 likes
    3. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @C_Trombley1

      Confirmed. See page 5 of the 1929 edition at https://archive.org/details/117714283/page/4/mode/2up …: "If r, φ, θ be polar coordinates in space…".

      2 replies 0 retweets 4 likes
    4. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      And confirmed in the 1901 edition at https://www.google.com/books/edition/Vector_Analysis/R5IKAAAAYAAJ?gbpv=1&pg=PA5 ….

      1 reply 0 retweets 3 likes
    5. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      As for Hamilton, we can see r, θ and r, θ, φ used on page 39 of his "Lectures on Quaternions" published in 1853, athttps://www.google.com/books/edition/Lectures_on_Quaternions/TCwPAAAAIAAJ?gbpv=1&pg=PA39 …

      1 reply 0 retweets 7 likes
    6. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      Following a reference from there brings us to "A treatise on the geometrical representation of the square roots of negative quantities" (1828) by John Warren. Here we see θ used often for angles starting on page 103 (as well as φ starting on page 112). https://archive.org/details/treatiseongeomet00warrrich/page/102/mode/2up …

      1 reply 0 retweets 15 likes
    7. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      Note also that Hamilton quotes an 1840 letter from John T. Graves making use of r, θ polar coordinates.https://www.google.com/books/edition/Lectures_on_Quaternions/TCwPAAAAIAAJ?gbpv=1&pg=PA40 …

      2 replies 0 retweets 4 likes
    8. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      And in Lacroix's "Sur le calcul differentiel et integral" (Babbage et al's 1816 translation presumably using the same variables as the 1802 original), we see θ used frequently for angles from at least page 660 on.https://www.google.com/books/edition/An_Elementary_Treatise_on_the_Differenti/AJsBAAAAYAAJ?gbpv=1&pg=PA660 …

      2 replies 0 retweets 4 likes
    9. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      See pages 664 and 682 for illustrative examples as well.

      2 replies 0 retweets 1 like
    10. macrocephalopod‏ @macrocephalopod 2 Dec 2021
      Replying to @RadishHarmers @C_Trombley1

      This is the content I’m following this account for.

      1 reply 0 retweets 1 like
      macrocephalopod‏ @macrocephalopod 2 Dec 2021
      Replying to @macrocephalopod @RadishHarmers @C_Trombley1

      The jokes are fine I guess but really it’s the deep mathematical notation lore that keeps me coming back.

      10:35 PM - 2 Dec 2021
      • 1 Like
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      1 reply 0 retweets 1 like
        1. Sridhar Ramesh‏ @RadishHarmers 2 Dec 2021
          Replying to @macrocephalopod @C_Trombley1

          I spend so much time noting that notation isn't the substance of math (as in all the never-endingly viral "order of operations" bullshit), but I do occasionally find myself curious about historical trivia like this.

          0 replies 0 retweets 2 likes
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