Mathematicians born on this day:
1768 : William Wallace 
Mathematicians who died on this day:
1657 : Joachim Jungius 
William Wallace  Urbain Le Verrier  Heinrich Bruns 
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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JOC/EFR May 2017  School of Mathematics and Statistics
University of St Andrews, Scotland 