by D. Hestenes, presents how Geometric Calculus has been developed from
Grassman algebras and other tools previous to Gibbs Calculus. You can see
how this is a powerful mathematics in a modern sense.
Some review of historical perspective can teach us how the creators of
modern physics saw their own work. Pauli expected new physics in 1933-1935
when divergences in quantum electrodynamics appeared. Dirac in his last
years, etc.
But sometimes historical perspective can be confused too. The old "law"
about the frequencies of emission and absorption of light is an example:
frequency of light emited < = frequency of incident light
A. Castellanos M.
Departamento de Fisica
Universidad de Sonora