Illumination by Tangent Lines

Details Illumination by Tangent Lines Illumination by Tangent Lines

2011-07-28

arxiv.org/abs/1107.5614v1

Mathematics

Classical Analysis and ODEs

Submitted for publication to the International Journal of Pure and Applied Mathematics. 22 pages, no figures

Scientific paper

Let f be a differentiable function on the real line, and let P\inG_{f}^{C}= all points not on the graph of f. We say that the illumination index of P, denoted by I_{f}(P), is k if there are k distinct tangents to the graph of f which pass through P. In section 2 we prove results about the illumination index of f with f" (x)\geq 0 on \Re. In particular, suppose that y=L_1(x) and y=L_2(x) are distinct oblique asymptotes of f and let P=(s,t)\in G_{f}^{C}. If max(L_1(s),L_2(s))

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