Let A; (j = 1,..., k) be matrices of size m, x nj. We introduce the notation o-1A, = (8A;) ® Ak = A1 ® A2 ® ...® Ak. %3D Consider the elementary matrices Eoo = (6 :), Eso = 1 E00 = (? :). (: ). (C ?)- E10 = E01 = E11 1 0 0 1 (i) Calculate O-1(E0o + Eo1 + E11) for k = 1, k = 2, k = 3 and k = 8. Give an interpretation of the result when each entry in the matrix represents a pixel (1 for black and 0 for white). This means we use the Kronecker product for representing images. (ii) Calculate (o-1(E00 + Eo1 + E10 + E11)) ® ( 0) 1 0 for k = 2 and give an interpretation as an image, i.e. each entry 0 is identified with a black pixel and an entry 1 with a white pixel. Discuss the case for arbitrary k.

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