Not unless either Twitter or email equals zero. (Unless you take "orthogonal" an... | Hacker News

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gjm11 on Oct 20, 2009 | parent | context | favorite | on: Why Email isn't Dying

Not unless either Twitter or email equals zero.

(Unless you take "orthogonal" and "parallel" to mean "there's a vector in one and a vector in the other that are orthogonal/parallel".)

DrJokepu on Oct 20, 2009 [–]

If I remember correctly, two lines being both parallel and orthogonal is quite possible in Hyperbolic (Non-Euclidean) Geometry.

10ren on Oct 20, 2009 | [–]

Parallel lines of longitude converge orthogonally at poles.

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