Mathematics – Algebraic Topology
Scientific paper
2005-02-16
Mathematics
Algebraic Topology
v2: Improved proof of Proposition 9.3
Scientific paper
We express the signature modulo 4 of a closed, oriented, $4k$-dimensional $PL$ manifold as a linear combination of its Euler characteristic and the new absolute torsion invariant defined in Korzeniewski [11]. Let $F \to E \to B$ be a $PL$ fibre bundle, where $F$, $E$ and $B$ are closed, connected, and compatibly oriented $PL$ manifolds. We give a formula for the absolute torsion of the total space $E$ in terms of the absolute torsion of the base and fibre, and then combine these two results to prove that the signature of $E$ is congruent modulo 4 to the product of the signatures of $F$ and $B$.
Hambleton Ian
Korzeniewski Andrew
Ranicki Andrew
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