Decomposing four-manifolds up to homotopy type.
Dedekind sums and signatures of intersection forms.
Dedekind sums, ..-invariants and the signature cocycle.
Die vierte Dimension.
Donaldson invariants of certain symplectic manifolds.
Donaldson series and (-1)-tori.
Dotted links, Heegaard diagrams, and colored graphs for PL 4-manifolds.
The present paper is devoted to establish a connection between the 4-manifold representation method by dotted framed links (or -in the closed case- by Heegaard diagrams) and the so called crystallization theory, which visualizes general PL-manifolds by means of edge-colored graphs.In particular, it is possible to obtain a crystallization of a closed 4-manifold M4 starting from a Heegaard diagram (#m(S1 x S2),ω) and the algorithmicity of the whole process depends on the effective possibility of recognizing...