Mathematicians Of The Day

25th November

On this day in 1915Albert Einstein Einstein submitted his paper The field equations of gravitation which give the correct field equations for general relativity.

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Quotation of the day

From Ismael Boulliau
As for the power by which the Sun seizes or holds the planets, and which, being corporeal, functions in the manner of hands, it is emitted in straight lines throughout the whole extent of the world, and like the species of the Sun, it turns with the body of the Sun; now, seeing that it is corporeal, it becomes weaker and attenuated at a greater distance or interval, and the ratio of its decrease in strength is the same as in the case of light, namely, the duplicate proportion, but inversely, of the distances that is, 1d2\Large\frac {1}{d^2}.