On the embedding dimension of 2-torsion lens spaces

Details On the embedding dimension of 2-torsion lens spaces On the embedding dimension of 2-torsion lens spaces

2009-06-04

arxiv.org/abs/0906.1001v1

Mathematics

Algebraic Topology

30 pages

Scientific paper

Using the $ku$- and $BP$-theoretic versions of Astey's cobordism obstruction for the existence of smooth Euclidean embeddings of stably almost complex manifolds, we prove that, for $e$ greater than or equal to $\alpha(n)$--the number of ones in the dyadic expansion of $n$--, the ($2n+1$)-dimensional $2^e$-torsion lens space cannot be embedded in Euclidean space of dimension $4n-2\alpha(n)+1$. A slightly restricted version of this fact holds for $e<\alpha(n)$. We also give an inductive construction of Euclidean embeddings for $2^e$-torsion lens spaces. Some of our best embeddings are within one dimension of being optimal.

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