MacTutor
Mathematicians Of The Day
27th July
On this day in 1837, Lejeune Dirichlet presented his first analytic number theory paper at a meeting of the Berlin Academy of Sciences. He proved the fundamental theorem that bears his name:
Every arithmetical sequence an + b, n = 0, 1, 2, ... of integers, where a and b are relatively prime, contains infinitely many primes.
The postage stamp of one of today's mathematicians at THIS LINK was issued in 1984.
Every arithmetical sequence an + b, n = 0, 1, 2, ... of integers, where a and b are relatively prime, contains infinitely many primes.
The postage stamp of one of today's mathematicians at THIS LINK was issued in 1984.
Click on Ⓟ for a poster.
Born:
- 1667: Johann Bernoulli Ⓟ
- 1801: George Airy Ⓟ
- 1844: Ágoston Scholtz
- 1848: Loránd Eötvös Ⓟ
- 1849: John Hopkinson Ⓟ
- 1867: Derrick Norman Lehmer Ⓟ
- 1871: Ernst Zermelo Ⓟ
- 1879: David Picken Ⓟ
- 1902: Reuben R McDaniel Ⓟ
- 1921: Jonas Kubilius Ⓟ
- 1930: Ismail Mohamed Ⓟ
Died:
- 1759: Pierre-Louis Moreau de Maupertuis Ⓟ
- 1870: Pierre-Joseph-Étienne Finck
- 1931: Jacques Herbrand Ⓟ
- 1987: Jan Mikusiński Ⓟ
- 1999: Aleksandr Aleksandrov Ⓟ
- 2015: J W S Cassels Ⓟ
- 2021: Enrique Planchart Ⓟ
Quotation of the day
From Johann Bernoulli
A quantity which is increased or decreased by an infinitely small quantity is neither increased nor decreased.
