Abstract

LetX;Y be manifolds of the same dimension. Given continuous mappings fi;gi : X ! Y , i = 0; 1, we consider the 1-parameter coincidence problem of nding homotopies ft;gt, 0 t 1, such that the number of coincidence points for the pair ft;gt is independent of t. When Y is the torus and f0;g0 are coincidence free we produce coincidence free pairs f1;g1 such that no homotopy joining them is coincidence free at each level. When X is also the torus we characterize the solution of the problem in terms of the Lefschetz coincidence number.

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