A robust method for the reconstruction of 3D object shape is described based on the inverse perspective method [1,2], which uses a single camera mounted on a commercial manipulator arm for accurate 3D positioning and orientation of the sensor head in 3D space. Preliminary measurements are presented and the reconstruction theory used by the technique.

It is known that Szpiro’s conjecture, or equivalently the ABC-conjecture, implies Lang’s conjecture giving a uniform lower bound for the canonical height of nontorsion points on elliptic curves. In this note we show that a significantly weaker version of Szpiro’s conjecture, which we call “prime-depleted,” suffices to prove Lang’s conjecture.

In this paper we show that under some fairly general conditions the Overfull Conjecture about the chromatic index of a graph G implies the Conformability Conjecture about the total chromatic number of G. We also show that if G has even order and high maximum degree, then G is conformable unless the de0ciency is very small. c © 2001 Elsevier Science B.V. All rights reserved.

The conjecture is true in dimension 2 since the only surfaces which have positive Euler characteristic are S2 and RP2 and they are the only two which are not aspherical. In the special case where M2k is a nonpositively curved Riemannian manifold this conjecture is usually attributed to Hopf by topologists and either to Chern or to both Chern and Hopf by differential geometers. When I first hear...

In this note we generalize and unify two results on connectivity of graphs: one by Balinsky and Barnette, one by Athanasiadis. This is done through a simple proof using commutative algebra tools. In particular we use bounds for the Castelnuovo–Mumford regularity of their Stanley–Reisner rings. As a result, if ∆ is a simplicial d-pseudomanifold and s is the largest integer such that ∆ has a miss...

If N = qkn2 is an odd perfect number, where q is the Euler prime, then we show that σ(n) ≤ qk is necessary and sufficient for Sorli’s conjecture that k = νq(N) = 1 to hold. It follows that, if k = 1 then the Euler prime q is the largest prime factor of N and that q > 10500. We also prove that qk < 23n 2.

We give a review of the mathematical and physical properties of the celebrated family of Calogero-like models and related spin chains.