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johncarlosbaez

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  1. Neutrinos and Gold [video] (youtube.com)
    2 points 1
  2. Why does current flow the opposite way from the electrons? (mathstodon.xyz)

    After fighting through a bunch of unhelpful answers, one gets to the bottom of things: Benjamin Franklin chose a convention that makes electrons negative, and apparently nobody knows why.

    245 points 253
  3. Hardy, Ramanujan and Taxi No. 1729 (johncarlosbaez.wordpress.com)
    134 points 24
  4. The first 10^1100 years of the universe (johncarlosbaez.wordpress.com)
    5 points 0
  5. The Biggest Open Questions About Neutrinos (johncarlosbaez.wordpress.com)
    2 points 0
  6. Free course an applied category theory for engineers (johncarlosbaez.wordpress.com)
    3 points 0
  7. A “mathematical phantom” is an object that does not exist, but acts as if it did (golem.ph.utexas.edu)
    2 points 0
  8. 24-cells in a 600-cell

    The 24-cell is a four-dimensional regular polytope with 24 vertices and 24 octahedral faces. The 600-cell is a four-dimensional regular polytope with 120 vertices and 600 tetrahedral faces. Since 120/24 = 5, you might…

    4 points 0
  9. Unproved Formulas of Ramanujan?

    A student asked me if any of Ramanujan's formulas remain unproved. I had to ask around. Here's the answer: https://johncarlosbaez.wordpress.com/2020/11/27/ramanujans-last-formula/

    1 points 0
  10. Ramanujan's Easiest Formula (johncarlosbaez.wordpress.com)
    215 points 72
  11. Epidemological Modeling with Category Theory (johncarlosbaez.wordpress.com)
    3 points 0