The asymptotic dimension theory was founded by Gromov in the early 90s. In this paper we give a survey of its recent history where we emphasize two of its features: an analogy with the dimension theory of compact metric spaces and applications to the theory of discrete groups.
The work discusses equivariant asymptotic dimension (also known as "wide equivariant covers", "$N$-$\mathcal F$-amenability" or "amenability dimension", and "$d$-BLR condition") and its generalisation, transfer reducibility, which are versions of asymptotic dimension invented for the proofs of the Farrell--Jones and Borel conjectures. We prove that groups of null equivariant asymptotic dimension are exactly virtually cyclic groups. We show that a covering of the boundary always extends to a covering of the whole compactification. We provide a number of characterisations of equivariant asymptot…
证明了渐近维数的可数并定理的一个版本,并将其应用于作用于渐近有限维度量空间上的群。作为结果,我们得到以下有限维定理。A)渐近有限维群的合并积具有有限的渐近维数:asdim A *_C B < infinity。B)设G'是群G的HNN扩张,且asdim G < infinity。则asdim G '<infinity。C)设Γ是由群π构造的Davis群,其中asdimπ<无穷大。则asdim r <无穷大。
We show that the asymptotic dimension of a hyperbolic relatively hyperbolic graph is finite provided that this holds true uniformly for the peripheral subgraphs and for the electrifiation. We use this to show that the asymptotic dimension of the disk graph of a handlebody of genus at least two is at most quadratic in the genus.
We introduce a geometric property complementary-finite asymptotic dimension (coas- dim). Similar with asymptotic dimension, we prove the corresponding coarse invariant theorem, union theorem and Hurewicz-type theorem.
Asymptotic property C was introduced by Dranishnikov to study spaces with infinite asymptotic dimension. We show that asymptotic property C is preserved by infinite products. We also show that countable restricted direct products of countable groups with finite asymptotic dimension have asymptotic property C. Then we introduce hyperbolic property C, an infinite dimensional version of hyperbolic dimension.
对一类包含离散群的度量空间X,证明了X的渐近Assouad-Nagata维数AN-asdim X与X的Higson日冕关于X上的次线性粗结构的覆盖维数$\dim(ν_L X)$一致.然后我们应用这个事实来证明等式AN-asdim(X x R)= AN-asdim X + 1。我们注意到Gromov的渐近维数asdim的类似等式通常不成立[Dr 3]。此外,我们还构造了一个从无基点的渐近锥面到次线性Higson日冕的内射映射。
In this paper we show that the asymptotic dimension of an unbounded proper metric space is bounded above by a coarse analog of Ponomarev's cofinal dimension of topological spaces, which we call the coarse cofinal dimension. We also show that asymptotic dimension is bounded below by the cofinal dimension of the Higson corona by existing results of Miyata, Austin, and Virk. We do this by introducing several constructions in the theory of coarse proximity spaces. In particular we introduce the inverse limit of coarse proximity spaces. We end with some open problems.