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Zhi Lü

Publications and source records attributed to Zhi Lü.

40 records · Page 3Linked to original sources

Small Covers over Prisms

In this paper we calculate the number of equivariant diffeomorphism classes of small covers over a prism.

math.DG↗

2-torus manifolds, cobordism and small covers

Let ${\frak M}_n$ be the set of equivariant unoriented cobordism classes of all $n$-dimensional 2-torus manifolds, where an $n$-dimensional 2-torus manifold $M$ is a smooth closed manifold of dimension $n$ with effective smooth action of a rank $n$ 2-torus group $({\Bbb Z}_2)^n$. Then ${\frak M}_n$ forms an abelian group with respect to disjoint union. This paper determines the group structure of ${\frak M}_n$ and shows that each class of ${\frak M}_n$ contains a small cover as its representative in the case $n=3$.

math.AT↗

$({\Bbb Z}_2)^k$-actions with $w(F)=1$

Suppose that $(Φ, M^n)$ is a smooth $({\Bbb Z}_2)^k$-action on a closed smooth $n$-dimensional manifold such that all Stiefel-Whitney classes of the tangent bundle to each connected component of the fixed point set $F$ vanish in positive dimension. This paper shows that if $\dim M^n>2^k\dim F$ and each $p$-dimensional part $F^p$ possesses the linear independence property, then $(Φ, M^n)$ bounds equivariantly, and in particular, $2^k\dim F$ is the best possible upper bound of $\dim M^n$ if $(Φ, M^n)$ is nonbounding.

math.AT↗