Property:Difficulty level

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Number

See Groupprops:Property:Difficulty level for details on the meanings of various levels.

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Showing 15 pages using this property.
C
Compact Hausdorff implies normal +
2  +
Compactness is coarsening-preserved +
1  +
Compactness is weakly hereditary +
1  +
Complete regularity is hereditary +
1  +
Connectedness is not box product-closed +
1  +
F
First-countable and T1 implies cardinality at most of continuum +
1  +
H
Hausdorff implies KC +
1  +
Hausdorff implies T1 +
0  +
Hausdorffness is hereditary +
1  +
Hausdorffness is refining-preserved +
1  +
N
Noetherian implies compact +
1  +
R
Resolvability is open subspace-closed +
1  +
S
Star-like implies contractible +
1  +
T
T1 is hereditary +
1  +
U
Ultraconnectedness is weakly hereditary +
1  +
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