9 comments

  • dang 5 days ago ago

    Related. Others?

    Visualizing quaternions (2018) - https://news.ycombinator.com/item?id=38043644 - Oct 2023 (42 comments)

    Visualizing quaternions: an explorable video series (2018) - https://news.ycombinator.com/item?id=31083042 - April 2022 (15 comments)

    Visualizing quaternions: An explorable video series - https://news.ycombinator.com/item?id=18310788 - Oct 2018 (32 comments)

  • srean 4 days ago ago

    Questions for mathematicians out here.

    Is there such a thing as quaternion analysis -- calculus of functions from quaternions to quaternions.

    What would be their key theorems ? What would be the analogue of conformal mappings, if any ?

    Any book recommendations would be gratefully appreciated.

    • Koshkin 4 days ago ago
      • srean 4 days ago ago

        Thanks a bunch

    • xeonmc 4 days ago ago

      A quaternion encodes uniform scaling + rotation. The logarithm of a quaternion is its axis-angle-nepers form, and vice versa.

          quat = sqrt( exp( nepers + radians * <axis> ) )
      
      So I think with this exponential map, the rest of its calculus can be extended from that.
      • srean 3 days ago ago

        Heard the word 'nepers' after many decades. Are you by any chance an Electrical major ?

        Thanks for your comment. To be fair, I had not done due diligence before asking. There's a Wikipedia pages on quaternion calculus.

        Complex analysis (calculus on functions from 2D rotations to 2D rotations) is beautiful -- Once differentiability guarantees infinite differentiability. Wondering what would the analogue of that be for quaternions

  • JKCalhoun 5 days ago ago

    Very cool.

    On MacOS: no audio on Safari, worked in Chrome though.

    I was odd to me to see that Ben Eater was involved. His talents are broad.

  • calebm 5 days ago ago

    Wow, this is very cool.