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Theorem iunordi 48769
Description: The indexed union of a collection of ordinal numbers 𝐵(𝑥) is ordinal. (Contributed by Emmett Weisz, 3-Nov-2019.)
Hypothesis
Ref Expression
iunordi.B Ord 𝐵
Assertion
Ref Expression
iunordi Ord 𝑥𝐴 𝐵
Distinct variable group:   𝑥,𝐴
Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem iunordi
StepHypRef Expression
1 iunord 48768 . 2 (∀𝑥𝐴 Ord 𝐵 → Ord 𝑥𝐴 𝐵)
2 iunordi.B . . 3 Ord 𝐵
32a1i 11 . 2 (𝑥𝐴 → Ord 𝐵)
41, 3mprg 3073 1 Ord 𝑥𝐴 𝐵
Colors of variables: wff setvar class
Syntax hints:  wcel 2108   ciun 5015  Ord word 6394
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3or 1088  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-pss 3996  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-iun 5017  df-br 5167  df-opab 5229  df-tr 5284  df-eprel 5599  df-po 5607  df-so 5608  df-fr 5652  df-we 5654  df-ord 6398  df-on 6399
This theorem is referenced by: (None)
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