MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  iunmapdisj Structured version   Visualization version   GIF version

Theorem iunmapdisj 9964
Description: The union 𝑛𝐶(𝐴m 𝑛) is a disjoint union. (Contributed by Mario Carneiro, 17-May-2015.) (Revised by NM, 16-Jun-2017.)
Assertion
Ref Expression
iunmapdisj ∃*𝑛𝐶 𝐵 ∈ (𝐴m 𝑛)
Distinct variable group:   𝐵,𝑛
Allowed substitution hints:   𝐴(𝑛)   𝐶(𝑛)

Proof of Theorem iunmapdisj
StepHypRef Expression
1 moeq 3666 . . . 4 ∃*𝑛 𝑛 = dom 𝐵
2 elmapi 8790 . . . . . 6 (𝐵 ∈ (𝐴m 𝑛) → 𝐵:𝑛𝐴)
3 fdm 6678 . . . . . . 7 (𝐵:𝑛𝐴 → dom 𝐵 = 𝑛)
43eqcomd 2739 . . . . . 6 (𝐵:𝑛𝐴𝑛 = dom 𝐵)
52, 4syl 17 . . . . 5 (𝐵 ∈ (𝐴m 𝑛) → 𝑛 = dom 𝐵)
65moimi 2540 . . . 4 (∃*𝑛 𝑛 = dom 𝐵 → ∃*𝑛 𝐵 ∈ (𝐴m 𝑛))
71, 6ax-mp 5 . . 3 ∃*𝑛 𝐵 ∈ (𝐴m 𝑛)
87moani 2548 . 2 ∃*𝑛(𝑛𝐶𝐵 ∈ (𝐴m 𝑛))
9 df-rmo 3352 . 2 (∃*𝑛𝐶 𝐵 ∈ (𝐴m 𝑛) ↔ ∃*𝑛(𝑛𝐶𝐵 ∈ (𝐴m 𝑛)))
108, 9mpbir 230 1 ∃*𝑛𝐶 𝐵 ∈ (𝐴m 𝑛)
Colors of variables: wff setvar class
Syntax hints:  wa 397   = wceq 1542  wcel 2107  ∃*wmo 2533  ∃*wrmo 3351  dom cdm 5634  wf 6493  (class class class)co 7358  m cmap 8768
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5257  ax-nul 5264  ax-pow 5321  ax-pr 5385  ax-un 7673
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ral 3062  df-rex 3071  df-rmo 3352  df-rab 3407  df-v 3446  df-sbc 3741  df-csb 3857  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-pw 4563  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-iun 4957  df-br 5107  df-opab 5169  df-mpt 5190  df-id 5532  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-iota 6449  df-fun 6499  df-fn 6500  df-f 6501  df-fv 6505  df-ov 7361  df-oprab 7362  df-mpo 7363  df-1st 7922  df-2nd 7923  df-map 8770
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator