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a statement that can be demonstrated to be true by accepted
mathematical operations and arguments
Carl Gauss
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discovered hyperbolic geometry
Thales of Miletus
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father of demonstrative mathematics. first to supply the "why"
postulate 3
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to describe any circle from any center with any length
Pythagoras
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if the lengths of the legs of a right triangle and c is its hypotenuse, then
a^2+b^2=c^2
constructible number
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