coordinate way

Let $P=(x,\\,y,\\,z)$ be a point in $\\mathbb{R}^{3}$ . If $N$ is the projection (http://planetmath.org/ProjectionOfPoint) of $P$ on the $x y$ -plane, $A$ the projection of $N$ on the $x$ -axis and $O$ the origin, then the broken line $P N A O$ is the coordinate way of the point $P$ . The lengths of the line segments forming the coordinate way are

AO=|x|,\\quad NA=|y|,\\quad PN=|z|.

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ProofOfVitalisTheorem
proof of Vitali’s Theorem
ProofOfVizingsTheoremforGraphs
proof of Vizing’s theorem (for graphs)
ProofOfVonNeumannDoubleCommutantTheorem
proof of von Neumann double commutant theorem
ProofOfWagnersTheorem
proof of Wagner’s theorem
ProofOfWaringsFormula
proof of Waring’s formula
ProofOfWeakMaximumPrincipleForRealDomains
proof of weak maximum principle for real domains
ProofOfWedderburnsTheorem
proof of Wedderburn’s theorem
ProofOfWeierstrassApproximationTheorem
proof of Weierstrass approximation theorem
ProofOfWeierstrassApproximationTheoremInRn
proof of Weierstrass approximation theorem in R^n
ProofOfWeierstrassCriterionOfUniformConvergence
ProofOfWeierstrassMtest
proof of Weierstrass M-test
proof of Weierstrass’ criterion of uniform convergence
ProofOfWeylsInequality
proof of Weyl’s inequality
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