Dimensions - A walk through mathematics (Part 1 of 9)

Dimensions by Jos Leys - Étienne Ghys - Aurélien Alvarez

Nine chapters, two hours of maths, that take you gradually up to the fourth dimension. Mathematical vertigo guaranteed!

Chapter 1: Dimension two Hipparchus explains how two numbers can describe the position of a point on a sphere. He then explains stereographic projection: how can one draw a picture of the Earth on a piece of paper?

More info here: http://www.dimensions-math.org/Dim_E.htm

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