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Theorem onsstopbas 36402
Description: The class of ordinal numbers is a subclass of the class of topological bases. (Contributed by Chen-Pang He, 8-Oct-2015.)
Assertion
Ref Expression
onsstopbas On ⊆ TopBases

Proof of Theorem onsstopbas
StepHypRef Expression
1 ontopbas 36401 . 2 (𝑥 ∈ On → 𝑥 ∈ TopBases)
21ssriv 3941 1 On ⊆ TopBases
Colors of variables: wff setvar class
Syntax hints:  wss 3905  Oncon0 6311  TopBasesctb 22848
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5238  ax-nul 5248  ax-pr 5374
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3397  df-v 3440  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-br 5096  df-opab 5158  df-tr 5203  df-eprel 5523  df-po 5531  df-so 5532  df-fr 5576  df-we 5578  df-ord 6314  df-on 6315  df-bases 22849
This theorem is referenced by:  onpsstopbas  36403
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