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It is shown that for many finite dimensional normed vector spaces V over C, a linear projection P : V → V will have nice structure if P + λ(I − P) is an isometry for some complex unit not equal to one. From these results, one can readily determine the structure of bicircular projections, i.e., those linear projections P such that P + µ(I − P) is a an… (More)

This article aims to deal with logistics and theory of graphs. We will describe the connection by the real-life logistics problems and graph theory.

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