n-dimensional space line -- point orthogonal projection

[make-github-pseudonymous-again]

//           o A                         r = W + µ a, µ in R
//           | 
//           | b                         X = W + µ a, for some µ
//           |                               __
//      a    |                           b = AX = A - X
// r - - - - o - - - o W
//           X                           a . b = 0

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• n-dimensional space q-flat -- point orthogonal projection #25