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(1991)The Hanna Neumann Conjecture states that if two subgroups of a finitely generated free group have finite ranks m and n, then their intersection has rank N which satisfies $N$ $$ 1 $\leq$ ($m$ $$ 1)($n$ $$ 1). The current ...
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(1969)
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(1995)We construct examples illustrating various aspects of Hodge theory on Riemannian manifolds. We consider the relationship between the harmonic forms on a product space and the harmonic forms on the factors as well as the ...
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(1958)
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(1981)This thesis is concerned with the properties of recursivelyenumerable setsthat is, sets which can be listed by Turingmachinesand their Turing degrees. We shall use the abbreviationr.e. to stand for the phrase recursively ...
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An Historical and Comparative Study Concerned With the Unsolvability of the Word Problem for Groups (1970)
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(1995)In this paper, we present two new spines for ribbon disc complements. We describe Craggs's 3dimensional spine and introduce a 2dimensional spine ${\cal W}\sp2$ which we show satisfies the homotopy reciprocity law. We ...
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(1964)
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(1989)A famous theorem of P. Hall gives a necessary and sufficient condition for a bipartite graph $\Gamma$ to possess a matching f. (A bipartite graph $\Gamma$ is a subset of the cartesian product of two finite sets X and Y. A ...
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Now showing items 270289 of 757