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SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
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Additional statements on relations and subclasses
Transitive relations (not to be confused with transitive classes).
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Table of Contents - 20.33.2.20. Transitive relations (not to be confused with transitive classes).
trrelind
xpintrreld
restrreld
trrelsuperreldg
trficl
cnvtrrel
trrelsuperrel2dg