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BASIC TOPOLOGY
Metric spaces
Pseudometric spaces
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ispsmet
Metamath Proof Explorer
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Structured
Table of Contents - 12.4.1. Pseudometric spaces
ispsmet
psmetdmdm
psmetf
psmetcl
psmet0
psmettri2
psmetsym
psmettri
psmetge0
psmetxrge0
psmetres2
psmetlecl
distspace