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SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
Mathbox for Thierry Arnoux
General Set Theory
Unordered pairs
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elpreq
Metamath Proof Explorer
Unicode
Structured
Table of Contents - 21.3.3.4. Unordered pairs
elpreq
prssad
prssbd
nelpr
inpr0
neldifpr1
neldifpr2
unidifsnel
unidifsnne