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Theorem onsupuni2 43192
Description: The supremum of a set of ordinals is the union of that set. (Contributed by RP, 22-Jan-2025.)
Assertion
Ref Expression
onsupuni2 (𝐴 ∈ 𝒫 On → sup(𝐴, On, E ) = 𝐴)

Proof of Theorem onsupuni2
StepHypRef Expression
1 elpwb 4567 . 2 (𝐴 ∈ 𝒫 On ↔ (𝐴 ∈ V ∧ 𝐴 ⊆ On))
2 onsupuni 43191 . . 3 ((𝐴 ⊆ On ∧ 𝐴 ∈ V) → sup(𝐴, On, E ) = 𝐴)
32ancoms 458 . 2 ((𝐴 ∈ V ∧ 𝐴 ⊆ On) → sup(𝐴, On, E ) = 𝐴)
41, 3sylbi 217 1 (𝐴 ∈ 𝒫 On → sup(𝐴, On, E ) = 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  Vcvv 3444  wss 3911  𝒫 cpw 4559   cuni 4867   E cep 5530  Oncon0 6320  supcsup 9367
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-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5246  ax-nul 5256  ax-pr 5382  ax-un 7691
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-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3351  df-reu 3352  df-rab 3403  df-v 3446  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-pss 3931  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5103  df-opab 5165  df-tr 5210  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-ord 6323  df-on 6324  df-iota 6452  df-riota 7326  df-sup 9369
This theorem is referenced by: (None)
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