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

Theorem fopwdom 9111
Description: Covering implies injection on power sets. (Contributed by Stefan O'Rear, 6-Nov-2014.) (Revised by Mario Carneiro, 24-Jun-2015.) (Revised by AV, 18-Sep-2021.)
Assertion
Ref Expression
fopwdom ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝒫 𝐵 ≼ 𝒫 𝐴)

Proof of Theorem fopwdom
Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 imassrn 6079 . . . . . 6 (𝐹𝑎) ⊆ ran 𝐹
2 dfdm4 5902 . . . . . . 7 dom 𝐹 = ran 𝐹
3 fof 6816 . . . . . . . 8 (𝐹:𝐴onto𝐵𝐹:𝐴𝐵)
43fdmd 6738 . . . . . . 7 (𝐹:𝐴onto𝐵 → dom 𝐹 = 𝐴)
52, 4eqtr3id 2782 . . . . . 6 (𝐹:𝐴onto𝐵 → ran 𝐹 = 𝐴)
61, 5sseqtrid 4034 . . . . 5 (𝐹:𝐴onto𝐵 → (𝐹𝑎) ⊆ 𝐴)
76adantl 480 . . . 4 ((𝐹𝑉𝐹:𝐴onto𝐵) → (𝐹𝑎) ⊆ 𝐴)
8 cnvexg 7938 . . . . . 6 (𝐹𝑉𝐹 ∈ V)
98adantr 479 . . . . 5 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝐹 ∈ V)
10 imaexg 7927 . . . . 5 (𝐹 ∈ V → (𝐹𝑎) ∈ V)
11 elpwg 4609 . . . . 5 ((𝐹𝑎) ∈ V → ((𝐹𝑎) ∈ 𝒫 𝐴 ↔ (𝐹𝑎) ⊆ 𝐴))
129, 10, 113syl 18 . . . 4 ((𝐹𝑉𝐹:𝐴onto𝐵) → ((𝐹𝑎) ∈ 𝒫 𝐴 ↔ (𝐹𝑎) ⊆ 𝐴))
137, 12mpbird 256 . . 3 ((𝐹𝑉𝐹:𝐴onto𝐵) → (𝐹𝑎) ∈ 𝒫 𝐴)
1413a1d 25 . 2 ((𝐹𝑉𝐹:𝐴onto𝐵) → (𝑎 ∈ 𝒫 𝐵 → (𝐹𝑎) ∈ 𝒫 𝐴))
15 imaeq2 6064 . . . . . . 7 ((𝐹𝑎) = (𝐹𝑏) → (𝐹 “ (𝐹𝑎)) = (𝐹 “ (𝐹𝑏)))
1615adantl 480 . . . . . 6 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → (𝐹 “ (𝐹𝑎)) = (𝐹 “ (𝐹𝑏)))
17 simpllr 774 . . . . . . 7 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝐹:𝐴onto𝐵)
18 simplrl 775 . . . . . . . 8 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝑎 ∈ 𝒫 𝐵)
1918elpwid 4615 . . . . . . 7 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝑎𝐵)
20 foimacnv 6861 . . . . . . 7 ((𝐹:𝐴onto𝐵𝑎𝐵) → (𝐹 “ (𝐹𝑎)) = 𝑎)
2117, 19, 20syl2anc 582 . . . . . 6 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → (𝐹 “ (𝐹𝑎)) = 𝑎)
22 simplrr 776 . . . . . . . 8 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝑏 ∈ 𝒫 𝐵)
2322elpwid 4615 . . . . . . 7 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝑏𝐵)
24 foimacnv 6861 . . . . . . 7 ((𝐹:𝐴onto𝐵𝑏𝐵) → (𝐹 “ (𝐹𝑏)) = 𝑏)
2517, 23, 24syl2anc 582 . . . . . 6 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → (𝐹 “ (𝐹𝑏)) = 𝑏)
2616, 21, 253eqtr3d 2776 . . . . 5 ((((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) ∧ (𝐹𝑎) = (𝐹𝑏)) → 𝑎 = 𝑏)
2726ex 411 . . . 4 (((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) → ((𝐹𝑎) = (𝐹𝑏) → 𝑎 = 𝑏))
28 imaeq2 6064 . . . 4 (𝑎 = 𝑏 → (𝐹𝑎) = (𝐹𝑏))
2927, 28impbid1 224 . . 3 (((𝐹𝑉𝐹:𝐴onto𝐵) ∧ (𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵)) → ((𝐹𝑎) = (𝐹𝑏) ↔ 𝑎 = 𝑏))
3029ex 411 . 2 ((𝐹𝑉𝐹:𝐴onto𝐵) → ((𝑎 ∈ 𝒫 𝐵𝑏 ∈ 𝒫 𝐵) → ((𝐹𝑎) = (𝐹𝑏) ↔ 𝑎 = 𝑏)))
31 rnexg 7916 . . . . 5 (𝐹𝑉 → ran 𝐹 ∈ V)
32 forn 6819 . . . . . 6 (𝐹:𝐴onto𝐵 → ran 𝐹 = 𝐵)
3332eleq1d 2814 . . . . 5 (𝐹:𝐴onto𝐵 → (ran 𝐹 ∈ V ↔ 𝐵 ∈ V))
3431, 33syl5ibcom 244 . . . 4 (𝐹𝑉 → (𝐹:𝐴onto𝐵𝐵 ∈ V))
3534imp 405 . . 3 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝐵 ∈ V)
3635pwexd 5383 . 2 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝒫 𝐵 ∈ V)
37 dmfex 7919 . . . 4 ((𝐹𝑉𝐹:𝐴𝐵) → 𝐴 ∈ V)
383, 37sylan2 591 . . 3 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝐴 ∈ V)
3938pwexd 5383 . 2 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝒫 𝐴 ∈ V)
4014, 30, 36, 39dom3d 9021 1 ((𝐹𝑉𝐹:𝐴onto𝐵) → 𝒫 𝐵 ≼ 𝒫 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 394   = wceq 1533  wcel 2098  Vcvv 3473  wss 3949  𝒫 cpw 4606   class class class wbr 5152  ccnv 5681  dom cdm 5682  ran crn 5683  cima 5685  wf 6549  ontowfo 6551  cdom 8968
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-sbc 3779  df-csb 3895  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-iota 6505  df-fun 6555  df-fn 6556  df-f 6557  df-f1 6558  df-fo 6559  df-fv 6561  df-dom 8972
This theorem is referenced by:  pwdom  9160  wdompwdom  9609
  Copyright terms: Public domain W3C validator