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We show that if a sequence s/ of natural numbers has no pair of elements whose difference is a positive square, then the density of J / n{l,...,«} is O(l/log«) c »), c n->-oo. This improves previous results which showed that the density converges to zero, but at a slower rate. We use a technique based on the method of Hardy and Littlewood together with a… (More)

- Richard Cole, Jeffrey S. Salowe, William L. Steiger, Endre Szemerédi
- SIAM J. Comput.
- 1989

- Jeffrey S. Salowe, William L. Steiger
- J. Algorithms
- 1987

- Chi-Yuan Lo, Jirí Matousek, William L. Steiger
- Discrete & Computational Geometry
- 1993

Given disjoint sets PI, P2 ..... Pd in R a with n points in total, a ham-sandwich cut is a hyperplane that simultaneously bisects the Pi. We present algorithms for finding ham-sandwich cuts in every dimension d > 1. When d = 2, the algorithm is optimal, having complexity O(n). For dimension d > 2, the bound on the running time is proportional to the… (More)

We show that in the deter-ministic comparison model for parallel computation, n processors can select the k th smallest item from a set of n numbers in O(loglogn) parallel time. With this result all comparison tasks (selection, merging, sorting), now have upper and lower bounds of the same order in both random and deter-ministic models.

- J. Michael Steele, William L. Steiger
- Discrete Applied Mathematics
- 1986

- Adrian Dumitrescu, William L. Steiger
- Discrete Mathematics
- 2000

Let Ë be a set with Ò Û · points in general position in the plane, Û of them white, and of them black, where Û and are even numbers. We show that there exists a matching of points of the same color with straight line segments and no crossings which matches at least ¿¿¿± of the points. We also derive an Ç´Ò ÐÓÓ Òµ algorithm which achieves this guarantee. On… (More)

- Gerard R. Richter, William L. Steiger
- Computing
- 1977

In this note we point out that polynomial least squares approximations may be unstable in coefficient space and stable inL 2. That is, an ill-conditioned basis may produce large errors in particular coefficients yet theL 2 error is small. An explanation of this phenomenon is offered. Wir zeigen, daß polynomiale Näherungen zu Kleinsten Fehlerquadraten, die… (More)

- Prabhakar Ragde, William L. Steiger, Endre Szemerédi, Avi Wigderson
- SIAM J. Discrete Math.
- 1988

We consider the problem of element distinctness. Here $n$ synchronized processors, each given an integer input, must decide whether these integers are pairwise distinct, while communicating via an infinitely large shared memory. If simultaneous write access to a memory cell is forbidden, then a lower bound of $\Omega(log n)$ on the number of steps easily… (More)

- William L. Steiger, Ileana Streinu
- Comput. Geom.
- 1998

We consider three problems about the illumination of planar regions with oodlights of prescribed angles. Problem 1 is the decision problem: given a wedge W of angle , n points p 1 ; ; p n in the plane and n angles 1 ; ; n summing up to , decide whether W can be illuminated by oodlights of angles 1 ; ; n placed in some order at the points p 1 ; ; p n and… (More)