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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive Mar 20

      Does anyone know if there is there a name for the idea that new concepts (such as negative numbers, complex numbers or type constructors in a type system) are only ever introduced into a preexisting "system" so that they can be eliminated later, after helping make some progress?

      37 replies 1 retweet 16 likes
    2. ∃ugene -Yokota  🥙‏ @eed3si9n Mar 20
      Replying to @propensive

      it sounds like lift in pedestrian fp, we say lift to mean raising A to F[A]. the motivation is for the convenience of F[A1] => F[A2], (F[A1], F[A2]) => F[A3], etc that are complicated in A space, but it could be more general like ℝ => ℍhttps://en.wikipedia.org/wiki/Lift_(mathematics) …

      1 reply 0 retweets 2 likes
    3. Jon Pretty‏ @propensive Mar 24
      Replying to @eed3si9n

      That's reminded me of a stats lecture I had in 2002. I remember nothing except the lecturer's description of a "dual" as like taking the elevator (i.e. "lift") down to the ground floor where you can move around easily, before taking a different lift up a different building...

      2 replies 0 retweets 0 likes
    4. Jon Pretty‏ @propensive Mar 24
      Replying to @propensive @eed3si9n

      I use the term "lift" all the time, and I remember the lecturer's explanation, but for some reason, this was the first time I related the figurative and literal lifts...

      1 reply 0 retweets 0 likes
    5. ∃ugene -Yokota  🥙‏ @eed3si9n Mar 24
      Replying to @propensive

      you're not allowed to claim that Englishmen have invented math(s) long before the Babylonians because of literal elevators

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive Mar 24
      Replying to @eed3si9n

      I'm not sure even which are the figurative and the literal elevators any more...

      8:31 AM - 24 Mar 2021
      • 1 Like
      • CodeFather
      0 replies 0 retweets 1 like

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