Gottlob Frege (1848-1925) was a German mathematician who didn't invent mathematics, but did invent modern predicate logic and quantified variables -- the language of mathematics in his 1879 book, Begriffsschrift. -> wikiwand.com/en/Gottlob_Freg…
The Dirac matrices (more commonly called gamma matrices) are a set of matrices introduced by Paul Dirac in his formulation of the Dirac equation.
They are fundamental in quantum mechanics and quantum field theory, especially for describing spin-½ particles such as the electron.
Paul Adrien Maurice Dirac (1902–1984) was one of the greatest theoretical physicists of the 20th century. He made groundbreaking contributions to quantum mechanics and quantum electrodynamics, and is regarded as one of the founders of modern physics...
A Berkeley history professor says he’s cut assigned reading from 100 pages a week to just 35.
Another said that a course which once required students to read seven full books now consists entirely of excerpts.
“We are now reaching a crisis point where if the number of pages goes down further, it’s unclear to me whether my discipline of history can really be taught.”
The attention span crisis is a civilization crisis.