Abstract

2R2 sin A sin B sin C rs ~=~~+ R = + R = + R. s s S l io I by Richard Johnsonbaugh, DePaul University, Chicago, IL. Let A(i, j) dee (i, j)-entry of the n x n matrix A, and interpret A(i, j) as the length of an dg directed from ver ex i to vertex j in an n-vertex digraph. It then follows that k( , j) is the length of a shor est path from i to j containing at most k edges. Thus A (i, j) is the length of a shortest path from i to j co taining a most r + s edges.

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