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Dec 5, 2017 at 16:51 comment added C.F.G Does this works for any plan? we know that $\Bbb R^2\subset\Bbb R^3$. if we consider $yz$-plan then I think this does not work?
Dec 5, 2017 at 16:45 history answered Bjørn Kjos-Hanssen CC BY-SA 3.0