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Symmetrizations of distance functions and $f$-quasimetric spaces
A. V. Greshnovab a Sobolev Institute of Mathematics, Novosibirsk, 630090 Russia
b Novosibirsk State University, Novosibirsk, 630090 Russia
Abstract:
We prove theorems on the topological equivalence of distance functions on spaces with weak and reverse weak symmetries. We study the topology induced by a distance function $\rho$ under the condition of the existence of a lower symmetrization for $\rho$ by an $f$-quasimetric. For $(q_1,q_2)$-metric spaces $(X,\rho)$, we also study the properties of their symmetrizations $ \min\big\{\rho(x,y),\rho(y,x) \big\} $ and $\max\big\{\rho(x,y),\rho(y,x) \big\} $. The relationship between the extreme points of a $(q_1,q_2)$-quasimetric $\rho$ and its symmetrizations $ \min\!\big\{\rho(x,y),\rho(y,x)\hskip-1pt \big\} $ and $\max\big\{\rho(x,y),\rho(y,x) \big\} $.
Key words:
distance function, $f$-quasimetric, $(q_1,q_2)$-quasimetric, symmetrization, extreme point.
Received: 24.04.2017
Citation:
A. V. Greshnov, “Symmetrizations of distance functions and $f$-quasimetric spaces”, Mat. Tr., 21:2 (2018), 150–162; Siberian Adv. Math., 29 (2019), 202–209
Linking options:
https://www.mathnet.ru/eng/mt343 https://www.mathnet.ru/eng/mt/v21/i2/p150
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Abstract page: | 251 | Full-text PDF : | 62 | References: | 28 | First page: | 4 |
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