23rd September

Mathematicians who were born or died on 23rd September


Mathematicians born on this day:

1768 : William Wallace
1791 : Johann Franz Encke
1819 : Hippolyte Fizeau
1851 : Ellen Hayes
1852 : Walter Gröbli
1900 : David van Dantzig
1910 : Lamberto Cesari
1968 : Wendelin Werner

Mathematicians who died on this day:

1657 : Joachim Jungius
1877 : Urbain Le Verrier
1919 : Heinrich Bruns
1938 : Maurice d'Ocagne
1971 : James Alexander
1982 : Bella Abramovna Subbotovskaya
1984 : Gheorghe Pic

Posters available   (Click on a link below)

William Wallace Urbain Le Verrier Heinrich Bruns


A quotation for today

David van Dantzig (1900 - 1959)

Neither in the subjective nor in the objective world can we find a criterion for the reality of the number concept, because the first contains no such concept, and the second contains nothing that is free from the concept. How then can we arrive at a criterion? Not by evidence, for the dice of evidence are loaded. Not by logic, for logic has no existence independent of mathematics: it is only one phase of this multiplied necessity that we call mathematics.
How then shall mathematical concepts be judged? They shall not be judged. Mathematics is the supreme arbiter. From its decisions there is no appeal.We cannot change the rules of the game, we cannot ascertain whether the game is fair. We can only study the player at his game; not, however, with the detached attitude of a bystander, for we are watching our own minds at play.

Another quotation by one of today's mathematicians


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School of Mathematics and Statistics
University of St Andrews, Scotland
https://www-history.mcs.st-andrews.ac.uk/Day_files/Day923.html