amenable groups上可合并的sofic群的自由积
Free products of sofic groups with amalgamation over monotileably amenable groups
摘要：
我们证明了sofic群的自由积在可单分服从子群上的合并是sofic的。因此，sofic群相对于monotileably顺从子群的同态的HNN扩展也是如此。我们还证明了独立均匀分布的置换矩阵族和某些非随机的置换矩阵族（本质上是来自sofic群的拟作用的置换矩阵）随着矩阵大小的无限增长而渐近无 *.
英文摘要：
We show that free products of sofic groups with amalgamation over monotileably amenable subgroups are sofic. Consequently, so are HNN extensions of sofic groups relative to homomorphisms of monotileably amenable subgroups. We also show that families of independent uniformly distributed permutation matrices and certain families of non-random permutation matrices (essentially, those coming from quasi--actions of a sofic group) are asymptotically *-free as the matrix size grows without bound.
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