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arXiv 1802.05784math.ATmath.DG
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积分和有理映射类

Integral and rational mapping classes

Fedor Manin, Shmuel Weinberger

摘要:

设$X$和$Y$是有限复形。当$Y$是幂零空间时,它有一个合理化$Y \to Y_{(0)}$,这是很好理解的。早期发现映射类集合上的诱导映射$[X,Y] \to [X,Y_{(0)}]$是有限对一的。原像的大小不需要有界,但是,我们表明,作为一个有理映射类的复杂性(在适当的意义上)的增加,这些大小是最多多项式。这种关于$[X,Y]$的“扭转”信息在某种意义上与有理同伦理论正交,但至少在某些情况下仍然是$Y$的有理同伦类型的不变量。复杂性的概念是几何的,我们还证明了一个猜想的Gromov \cite{GrMS}关于映射类的数量,有Lipschitz常数最多$L$。

英文摘要:

Let $X$ and $Y$ be finite complexes. When $Y$ is a nilpotent space, it has a rationalization $Y \to Y_{(0)}$ which is well-understood. Early on it was found that the induced map $[X,Y] \to [X,Y_{(0)}]$ on sets of mapping classes is finite-to-one. The sizes of the preimages need not be bounded; we show, however, that as the complexity (in a suitable sense) of a rational mapping class increases, these sizes are at most polynomial. This ``torsion'' information about $[X,Y]$ is in some sense orthogonal to rational homotopy theory but is nevertheless an invariant of the rational homotopy type of $Y$ in at least some cases. The notion of complexity is geometric and we also prove a conjecture of Gromov \cite{GrMS} regarding the number of mapping classes that have Lipschitz constant at most $L$.

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