image

  • Amazon

  • One side/both sides

  • retrogression

  • CAPUS

  • Augusto Moebius.

  • Felix Klein.

    • Famous for the Klein Vase
    • Erlangen Program
      • Geometry is the study of properties of spaces such that they are invariant under the action of transformation groups
      • Conversion” extended beyond joint conversions.

p.50

  • Reversal against unit yen
  • Add an infinity point to the complex plane → Riemann sphere 1854

p.213


This page is auto-translated from /nishio/インドラの真珠 using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.