Database
SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
Mathbox for Thierry Arnoux
Topology
Open cover refinement property
ccref
Next ⟩
df-cref
Metamath Proof Explorer
Unicode
Structured
Syntax definition
ccref
Description:
The "every open cover has an
A
refinement" predicate.
Ref
Expression
Assertion
ccref
class CovHasRef A