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math.LO2023
Echeloned Spaces
Maxime Gheysens, Bojana Pavlica, Christian Pech +2
We introduce the notion of echeloned spaces - an order-theoretic abstraction of metric spaces. The first step is to characterize metrizable echeloned spaces. It turns out that morp…
math.LO2023
Homogeneous ultrametric structures
W. Kubiś, Ch. Pech, M. Pech
We develop the theory of homogeneous Polish ultrametric structures. Our starting point is a Fraisse class of finite structures and the crucial tool is the universal homogeneous epi…