函数的迭代与无环 2-复形的可缩性
群论
2020-03-23 v3 几何拓扑
摘要
我们证明,不存在算法能够判定无限递归描述的无环球面 2-复形是否可缩。我们构造了这样一个复形,它是可缩的当且仅当 Collatz 猜想成立。
引用
@article{arxiv.1910.00931,
title = {Iteration of functions and contractibility of acyclic 2-complexes},
author = {Ian J Leary},
journal= {arXiv preprint arXiv:1910.00931},
year = {2020}
}
备注
Third version: more minor misprints removed