1879
ID: 364
Gottlob Frege publishes 'Begriffsschrift', introducing predicate logic with quantifiers and establishing modern symbolic logic
ID: 364
1879
ID: 409
Alfred Kempe publishes a 'proof' of the Four Color Theorem (later shown to be flawed)
ID: 409
1879
ID: 1017
Dual Alliance between Germany and Austria-Hungary established
ID: 1017
1879
ID: 1018
William Tebb founds Anti-Vaccination Society of America in New York; Vaccination Inquirer founded
ID: 1018
1879
ID: 1019
Thomas Edison perfects the incandescent light bulb
ID: 1019
1879
ID: 1020
Gottlob Frege publishes Begriffsschrift, creating mathematical logic notation
ID: 1020
1879
ID: 1021
Georg Cantor develops systematic theory of ordinal numbers - analysis of different types of infinity
ID: 1021
1879
ID: 1022
Constantin Fahlberg discovers saccharin in Ira Remsen's laboratory at Johns Hopkins
ID: 1022
1879
ID: 4469
James Ritty invents cash register - mechanical calculator for business transactions, sold to NCR in 1884
ID: 4469
1879
ID: 4586
Planck receives doctorate from Munich - dissertation on second law of thermodynamics, age 21
ID: 4586
1879
ID: 1016
August 4, 1879
Pope Leo XIII issues Aeterni Patris promoting Thomistic philosophy in seminaries
ID: 1016
1879
ID: 1023
August 21, 1879
Our Lady of Knock - silent apparition with St. Joseph, St. John, Lamb on altar, 15 witnesses
ID: 1023