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Electronic Colloquium on Computational Complexity

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TR10-152 | 6th October 2010
Alexey Pospelov

Faster Polynomial Multiplication via Discrete Fourier Transforms

We study the complexity of polynomial multiplication over arbitrary fields. We present a unified approach that generalizes all known asymptotically fastest algorithms for this problem. In particular, the well-known algorithm for multiplication of polynomials over fields supporting DFTs of large smooth orders, Schönhage-Strassen's algorithm over arbitrary fields of characteristic different ... more >>>


TR10-151 | 30th September 2010
Raghunath Tewari, N. V. Vinodchandran

Green’s Theorem and Isolation in Planar Graphs

We show a simple application of Green’s theorem from multivariable calculus to the isolation problem in planar graphs. In particular, we construct a skew-symmetric, polynomially bounded, edge weight function for a directed planar graph in logspace such that the weight of any simple cycle in the graph is non-zero with ... more >>>


TR10-150 | 19th September 2010
Bjørn Kjos-Hanssen

A strong law of computationally weak subsets

We show that in the setting of fair-coin measure on the power set of the natural numbers, each sufficiently random set has an infinite subset that computes no random set. That is, there is an almost sure event $\mathcal A$ such that if $X\in\mathcal A$ then $X$ has an infinite ... more >>>



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