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arXiv · 2207.07614

Fixed Points and Noetherian Topologies

Aliaume Lopez
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Abstract

This paper provides a canonical construction of a Noetherian least fixed point topology. While such least fixed point are not Noetherian in general, we prove that under a mild assumption, one can use a topological minimal bad sequence argument to prove that they are. We then apply this fixed point theorem to rebuild known Noetherian topologies with a uniform proof. In the case of spaces that are defined inductively (such as finite words and finite trees), we provide a uniform definition of a divisibility topology using our fixed point theorem. We then prove that the divisibility topology is a generalisation of the divisibility preorder introduced by Hasegawa in the case of well-quasi-orders.

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Aliaume Lopez. 2022-10-17. Fixed Points and Noetherian Topologies. https://arxiv.org/abs/2207.07614

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