Viktor Bunyakovsky worked on Number Theory as well as geometry, mechanics and hydrostatics. He discovered the Cauchy-Schwarz inequality 25 years before Cauchy or Schwarz.
Tuesday, April 10, 2007
The Cauchy-BUNYAKOVSKY-Schwarz inequality
Episode #2583 of "By the law of large numbers (of Russian mathematicians), your theorem has been proved by some Russian before you even thought of it":