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Timeline for about parabolic cone

Current License: CC BY-SA 3.0

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Oct 29, 2012 at 13:14 comment added jiangsaiyin @Anton Petrunin:Nice formula.But I don't know how to get the formula.BGp(Alex 1) gives the elliptic cone formula,but no parabolic cone.
Oct 23, 2012 at 22:56 history answered Anton Petrunin CC BY-SA 3.0