subject to C₁1++Cpp min ! 1,...,p a11x1 + a12x2 + + a1pxpa1 a21x1 + a22x2 + + a2pxp ≤a2, ak1x1 +ak2x2 + ... + AkpXp ≤ Akı (a) Show that when both u≤v and -u ≤v, then |u| ≤v. (b) Show how the quantile regression fitting of a + Bx; with p = 1/2 - that is, fitting by the least absolute values can be written in the form given above.

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