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Theorem unxpdom 9284
Description: Cartesian product dominates union for sets with cardinality greater than 1. Proposition 10.36 of [TakeutiZaring] p. 93. (Contributed by Mario Carneiro, 13-Jan-2013.) (Proof shortened by Mario Carneiro, 27-Apr-2015.)
Assertion
Ref Expression
unxpdom ((1o𝐴 ∧ 1o𝐵) → (𝐴𝐵) ≼ (𝐴 × 𝐵))

Proof of Theorem unxpdom
Dummy variables 𝑥 𝑦 𝑢 𝑡 𝑣 𝑤 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relsdom 8977 . . . 4 Rel ≺
21brrelex2i 5739 . . 3 (1o𝐴𝐴 ∈ V)
31brrelex2i 5739 . . 3 (1o𝐵𝐵 ∈ V)
42, 3anim12i 611 . 2 ((1o𝐴 ∧ 1o𝐵) → (𝐴 ∈ V ∧ 𝐵 ∈ V))
5 breq2 5156 . . . . 5 (𝑥 = 𝐴 → (1o𝑥 ↔ 1o𝐴))
65anbi1d 629 . . . 4 (𝑥 = 𝐴 → ((1o𝑥 ∧ 1o𝑦) ↔ (1o𝐴 ∧ 1o𝑦)))
7 uneq1 4157 . . . . 5 (𝑥 = 𝐴 → (𝑥𝑦) = (𝐴𝑦))
8 xpeq1 5696 . . . . 5 (𝑥 = 𝐴 → (𝑥 × 𝑦) = (𝐴 × 𝑦))
97, 8breq12d 5165 . . . 4 (𝑥 = 𝐴 → ((𝑥𝑦) ≼ (𝑥 × 𝑦) ↔ (𝐴𝑦) ≼ (𝐴 × 𝑦)))
106, 9imbi12d 343 . . 3 (𝑥 = 𝐴 → (((1o𝑥 ∧ 1o𝑦) → (𝑥𝑦) ≼ (𝑥 × 𝑦)) ↔ ((1o𝐴 ∧ 1o𝑦) → (𝐴𝑦) ≼ (𝐴 × 𝑦))))
11 breq2 5156 . . . . 5 (𝑦 = 𝐵 → (1o𝑦 ↔ 1o𝐵))
1211anbi2d 628 . . . 4 (𝑦 = 𝐵 → ((1o𝐴 ∧ 1o𝑦) ↔ (1o𝐴 ∧ 1o𝐵)))
13 uneq2 4158 . . . . 5 (𝑦 = 𝐵 → (𝐴𝑦) = (𝐴𝐵))
14 xpeq2 5703 . . . . 5 (𝑦 = 𝐵 → (𝐴 × 𝑦) = (𝐴 × 𝐵))
1513, 14breq12d 5165 . . . 4 (𝑦 = 𝐵 → ((𝐴𝑦) ≼ (𝐴 × 𝑦) ↔ (𝐴𝐵) ≼ (𝐴 × 𝐵)))
1612, 15imbi12d 343 . . 3 (𝑦 = 𝐵 → (((1o𝐴 ∧ 1o𝑦) → (𝐴𝑦) ≼ (𝐴 × 𝑦)) ↔ ((1o𝐴 ∧ 1o𝐵) → (𝐴𝐵) ≼ (𝐴 × 𝐵))))
17 eqid 2728 . . . 4 (𝑧 ∈ (𝑥𝑦) ↦ if(𝑧𝑥, ⟨𝑧, if(𝑧 = 𝑣, 𝑤, 𝑡)⟩, ⟨if(𝑧 = 𝑤, 𝑢, 𝑣), 𝑧⟩)) = (𝑧 ∈ (𝑥𝑦) ↦ if(𝑧𝑥, ⟨𝑧, if(𝑧 = 𝑣, 𝑤, 𝑡)⟩, ⟨if(𝑧 = 𝑤, 𝑢, 𝑣), 𝑧⟩))
18 eqid 2728 . . . 4 if(𝑧𝑥, ⟨𝑧, if(𝑧 = 𝑣, 𝑤, 𝑡)⟩, ⟨if(𝑧 = 𝑤, 𝑢, 𝑣), 𝑧⟩) = if(𝑧𝑥, ⟨𝑧, if(𝑧 = 𝑣, 𝑤, 𝑡)⟩, ⟨if(𝑧 = 𝑤, 𝑢, 𝑣), 𝑧⟩)
1917, 18unxpdomlem3 9283 . . 3 ((1o𝑥 ∧ 1o𝑦) → (𝑥𝑦) ≼ (𝑥 × 𝑦))
2010, 16, 19vtocl2g 3562 . 2 ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ((1o𝐴 ∧ 1o𝐵) → (𝐴𝐵) ≼ (𝐴 × 𝐵)))
214, 20mpcom 38 1 ((1o𝐴 ∧ 1o𝐵) → (𝐴𝐵) ≼ (𝐴 × 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 394   = wceq 1533  wcel 2098  Vcvv 3473  cun 3947  ifcif 4532  cop 4638   class class class wbr 5152  cmpt 5235   × cxp 5680  1oc1o 8486  cdom 8968  csdm 8969
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2166  ax-ext 2699  ax-sep 5303  ax-nul 5310  ax-pow 5369  ax-pr 5433  ax-un 7746
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2529  df-eu 2558  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2938  df-ral 3059  df-rex 3068  df-rab 3431  df-v 3475  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4327  df-if 4533  df-pw 4608  df-sn 4633  df-pr 4635  df-op 4639  df-uni 4913  df-br 5153  df-opab 5215  df-mpt 5236  df-id 5580  df-xp 5688  df-rel 5689  df-cnv 5690  df-co 5691  df-dm 5692  df-rn 5693  df-res 5694  df-ima 5695  df-suc 6380  df-iota 6505  df-fun 6555  df-fn 6556  df-f 6557  df-f1 6558  df-fo 6559  df-f1o 6560  df-fv 6561  df-1o 8493  df-2o 8494  df-en 8971  df-dom 8972  df-sdom 8973
This theorem is referenced by:  unxpdom2  9285  sucxpdom  9286  djuxpdom  10216
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