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Nielsen theory of transversal fixed point sets (with an appendix: C and C0 fixed point sets are the same, by R. E. Greene)

Helga Schirmer (1992)

Fundamenta Mathematicae

Examples exist of smooth maps on the boundary of a smooth manifold M which allow continuous extensions over M without fixed points but no such smooth extensions. Such maps are studied here in more detail. They have a minimal fixed point set when all transversally fixed maps in their homotopy class are considered. Therefore we introduce a Nielsen fixed point theory for transversally fixed maps on smooth manifolds without or with boundary, and use it to calculate the minimum number of fixed points...

On equivariant deformations of maps.

Antonio Vidal (1988)

Publicacions Matemàtiques

We work in the smooth category: manifolds and maps are meant to be smooth. Let G be a finite group acting on a connected closed manifold X and f an equivariant self-map on X with f|A fixpointfree, where A is a closed invariant submanifold of X with codim A ≥ 3. The purpose of this paper is to give a proof using obstruction theory of the following fact: If X is simply connected and the action of G on X - A is free, then f is equivariantly deformable rel. A to fixed point free map if and only if the...

On finite groups acting on acyclic complexes of dimension two.

Carles Casacuberta, Warren Dicks (1992)

Publicacions Matemàtiques

We conjecture that every finite group G acting on a contractible CW-complex X of dimension 2 has at least one fixed point. We prove this in the case where G is solvable, and under this additional hypothesis, the result holds for X acyclic.

On metrics of characteristic zero

Władysław Kulpa (2013)

Colloquium Mathematicae

We introduce and study the concept of characteristic for metrics. It turns out that metrizable spaces endowed with an L*-operator which admit a metric of characteristic zero play an important role in the theory of fixed points. We prove the existence of such spaces among infinite-dimensional linear topological spaces.

On Nash theorem

Władysław Kulpa, Andrzej Szymański (2002)

Acta Universitatis Carolinae. Mathematica et Physica

On the computation of the Nielsen numbers and the converse of the Lefschetz coincidence theorem

Peter Wong (1992)

Fundamenta Mathematicae

Let f , g : M 1 M 2 be maps where M 1 and M 2 are connected triangulable oriented n-manifolds so that the set of coincidences C f , g = x M 1 | f ( x ) = g ( x ) is compact in M 1 . We define a Nielsen equivalence relation on C f , g and assign the coincidence index to each Nielsen coincidence class. In this note, we show that, for n ≥ 3, if M 2 = M ˜ 2 / K where M ˜ 2 is a connected simply connected topological group and K is a discrete subgroup then all the Nielsen coincidence classes of f and g have the same coincidence index. In particular, when M 1 and M 2 are compact, f...

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