Mathematicians born on this day:
1728 : Lambert 
Mathematicians who died on this day:
1349 : Bradwardine 
Johann Lambert  Wolfgang Krull 
Johann H Lambert (1728  1777)
Proofs of the Euclidean [parallel] postulate can be developed to such an extent that apparently a mere trifle remains. But a careful analysis shows that in this seeming trifle lies the crux of the matter; usually it contains either the proposition that is being proved or a postulate equivalent to it.
Quoted in C B Boyer, A History of Mathematics (New York 1968)
Another quotation by one of today's mathematicians
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