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Relative Newton numbers. (English) Zbl 0765.52016
We describe a method for estimating the number of congruent copies of a convex body \(C\) in the plane that can touch another given body \(K\) without having interior points in common. This applies also to the case \(K=C\) thus giving bounds for the usual Newton number \(N(K)\) of \(K\). Especially we get \(N(T)=21\) for the isosceles triangle having base angles of \(30^ \circ\).
Reviewer: Gerd Wegner
52C15 Packing and covering in \(2\) dimensions (aspects of discrete geometry)
52A10 Convex sets in \(2\) dimensions (including convex curves)
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