At the Institut Henri Poincaré in Paris, the models are not famous for being sexy. Crafted out of wood and plaster in the early twentieth century, they're mathematical models, designed to aid the ...
The plaster model shows elliptic paraboloid. The surface is represented by the equation: x 2 /a 2 + y 2 / b 2 = -2z. The apex of the surface is at the origin (so that all the values of z are negative) ...
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