Mathematicians Of The Day

7th January

On this day in 1610, Galileo first spotted that Jupiter had moons. By the 13th he had discovered four of them.

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Quotation of the day

From Émile Borel
The goal of geometry is to study those properties of bodies which can be considered independent of their matter, but only with respect their dimensions and forms. Geometry measures the surface of a field without bothering to find if the soil is good or bad.