Why there are no 3D complex numbers
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Imaginary numbers aren't imaginary
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The Man Who Almost Broke Math (And Himself...)
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Derivation of the Euler-Lagrange equations
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Los fantásticos Cuaterniones - Numberphile
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Geometry to algebra to calculus in 20 minutes.
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Do Complex Numbers Exist?
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Find the area of any polygon.
17:38