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Theorem iunmapdisj 10115
Description: The union ∪ 𝑛 ∈ 𝐶(𝐴 ↑m 𝑛) is a disjoint union. (Contributed by Mario Carneiro, 17-May-2015.) (Revised by NM, 16-Jun-2017.)
Assertion
Ref Expression
iunmapdisj ∃*𝑛 ∈ 𝐶 𝐵 ∈ (𝐴 ↑m 𝑛)
Distinct variable group:   𝐵,𝑛
Allowed substitution hints:   𝐴(𝑛)   𝐶(𝑛)

Proof of Theorem iunmapdisj
StepHypRef Expression
1 moeq 3668 . . . 4 ∃*𝑛 𝑛 = dom 𝐵
2 elmapi 8883 . . . . . 6 (𝐵 ∈ (𝐴 ↑m 𝑛) → 𝐵:𝑛⟶𝐴)
3 fdm 6730 . . . . . . 7 (𝐵:𝑛⟶𝐴 → dom 𝐵 = 𝑛)
43eqcomd 2769 . . . . . 6 (𝐵:𝑛⟶𝐴 → 𝑛 = dom 𝐵)
52, 4syl 18 . . . . 5 (𝐵 ∈ (𝐴 ↑m 𝑛) → 𝑛 = dom 𝐵)
65moimi 2573 . . . 4 (∃*𝑛 𝑛 = dom 𝐵 → ∃*𝑛 𝐵 ∈ (𝐴 ↑m 𝑛))
71, 6ax-mp 5 . . 3 ∃*𝑛 𝐵 ∈ (𝐴 ↑m 𝑛)
87moani 2581 . 2 ∃*𝑛(𝑛 ∈ 𝐶 ∧ 𝐵 ∈ (𝐴 ↑m 𝑛))
9 df-rmo 3369 . 2 (∃*𝑛 ∈ 𝐶 𝐵 ∈ (𝐴 ↑m 𝑛) ↔ ∃*𝑛(𝑛 ∈ 𝐶 ∧ 𝐵 ∈ (𝐴 ↑m 𝑛)))
108, 9mpbir 234 1 ∃*𝑛 ∈ 𝐶 𝐵 ∈ (𝐴 ↑m 𝑛)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∧ wa 401   = wceq 1569   ∈ wcel 2146  ∃*wmo 2565  ∃*wrmo 3368  dom cdm 5655  ⟶wf 6543  (class class class)co 7430   ↑m cmap 8861
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7761
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rmo 3369  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6501  df-fun 6549  df-fn 6550  df-f 6551  df-fv 6555  df-ov 7433  df-oprab 7434  df-mpo 7435  df-1st 8011  df-2nd 8012  df-map 8863
This theorem is used by: (None)
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