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Theorem fliftfun 5487
Description: The function 𝐹 is the unique function defined by 𝐹𝐴 = 𝐵, provided that the well-definedness condition holds. (Contributed by Mario Carneiro, 23-Dec-2016.)
Hypotheses
Ref Expression
flift.1 𝐹 = ran (𝑥𝑋 ↦ ⟨𝐴, 𝐵⟩)
flift.2 ((𝜑𝑥𝑋) → 𝐴𝑅)
flift.3 ((𝜑𝑥𝑋) → 𝐵𝑆)
fliftfun.4 (𝑥 = 𝑦𝐴 = 𝐶)
fliftfun.5 (𝑥 = 𝑦𝐵 = 𝐷)
Assertion
Ref Expression
fliftfun (𝜑 → (Fun 𝐹 ↔ ∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷)))
Distinct variable groups:   𝑦,𝐴   𝑦,𝐵   𝑥,𝐶   𝑥,𝑦,𝑅   𝑥,𝐷   𝑦,𝐹   𝜑,𝑥,𝑦   𝑥,𝑋,𝑦   𝑥,𝑆,𝑦
Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑥)   𝐶(𝑦)   𝐷(𝑦)   𝐹(𝑥)

Proof of Theorem fliftfun
Dummy variables 𝑣 𝑢 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nfv 1462 . . 3 𝑥𝜑
2 flift.1 . . . . 5 𝐹 = ran (𝑥𝑋 ↦ ⟨𝐴, 𝐵⟩)
3 nfmpt1 3891 . . . . . 6 𝑥(𝑥𝑋 ↦ ⟨𝐴, 𝐵⟩)
43nfrn 4627 . . . . 5 𝑥ran (𝑥𝑋 ↦ ⟨𝐴, 𝐵⟩)
52, 4nfcxfr 2220 . . . 4 𝑥𝐹
65nffun 4974 . . 3 𝑥Fun 𝐹
7 fveq2 5229 . . . . . . 7 (𝐴 = 𝐶 → (𝐹𝐴) = (𝐹𝐶))
8 simplr 497 . . . . . . . . 9 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → Fun 𝐹)
9 flift.2 . . . . . . . . . . 11 ((𝜑𝑥𝑋) → 𝐴𝑅)
10 flift.3 . . . . . . . . . . 11 ((𝜑𝑥𝑋) → 𝐵𝑆)
112, 9, 10fliftel1 5485 . . . . . . . . . 10 ((𝜑𝑥𝑋) → 𝐴𝐹𝐵)
1211ad2ant2r 493 . . . . . . . . 9 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → 𝐴𝐹𝐵)
13 funbrfv 5264 . . . . . . . . 9 (Fun 𝐹 → (𝐴𝐹𝐵 → (𝐹𝐴) = 𝐵))
148, 12, 13sylc 61 . . . . . . . 8 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝐴) = 𝐵)
15 simprr 499 . . . . . . . . . . 11 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → 𝑦𝑋)
16 eqidd 2084 . . . . . . . . . . 11 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → 𝐶 = 𝐶)
17 eqidd 2084 . . . . . . . . . . 11 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → 𝐷 = 𝐷)
18 fliftfun.4 . . . . . . . . . . . . . 14 (𝑥 = 𝑦𝐴 = 𝐶)
1918eqeq2d 2094 . . . . . . . . . . . . 13 (𝑥 = 𝑦 → (𝐶 = 𝐴𝐶 = 𝐶))
20 fliftfun.5 . . . . . . . . . . . . . 14 (𝑥 = 𝑦𝐵 = 𝐷)
2120eqeq2d 2094 . . . . . . . . . . . . 13 (𝑥 = 𝑦 → (𝐷 = 𝐵𝐷 = 𝐷))
2219, 21anbi12d 457 . . . . . . . . . . . 12 (𝑥 = 𝑦 → ((𝐶 = 𝐴𝐷 = 𝐵) ↔ (𝐶 = 𝐶𝐷 = 𝐷)))
2322rspcev 2710 . . . . . . . . . . 11 ((𝑦𝑋 ∧ (𝐶 = 𝐶𝐷 = 𝐷)) → ∃𝑥𝑋 (𝐶 = 𝐴𝐷 = 𝐵))
2415, 16, 17, 23syl12anc 1168 . . . . . . . . . 10 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → ∃𝑥𝑋 (𝐶 = 𝐴𝐷 = 𝐵))
252, 9, 10fliftel 5484 . . . . . . . . . . 11 (𝜑 → (𝐶𝐹𝐷 ↔ ∃𝑥𝑋 (𝐶 = 𝐴𝐷 = 𝐵)))
2625ad2antrr 472 . . . . . . . . . 10 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → (𝐶𝐹𝐷 ↔ ∃𝑥𝑋 (𝐶 = 𝐴𝐷 = 𝐵)))
2724, 26mpbird 165 . . . . . . . . 9 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → 𝐶𝐹𝐷)
28 funbrfv 5264 . . . . . . . . 9 (Fun 𝐹 → (𝐶𝐹𝐷 → (𝐹𝐶) = 𝐷))
298, 27, 28sylc 61 . . . . . . . 8 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝐶) = 𝐷)
3014, 29eqeq12d 2097 . . . . . . 7 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝐴) = (𝐹𝐶) ↔ 𝐵 = 𝐷))
317, 30syl5ib 152 . . . . . 6 (((𝜑 ∧ Fun 𝐹) ∧ (𝑥𝑋𝑦𝑋)) → (𝐴 = 𝐶𝐵 = 𝐷))
3231anassrs 392 . . . . 5 ((((𝜑 ∧ Fun 𝐹) ∧ 𝑥𝑋) ∧ 𝑦𝑋) → (𝐴 = 𝐶𝐵 = 𝐷))
3332ralrimiva 2439 . . . 4 (((𝜑 ∧ Fun 𝐹) ∧ 𝑥𝑋) → ∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷))
3433exp31 356 . . 3 (𝜑 → (Fun 𝐹 → (𝑥𝑋 → ∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷))))
351, 6, 34ralrimd 2444 . 2 (𝜑 → (Fun 𝐹 → ∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷)))
362, 9, 10fliftel 5484 . . . . . . . . 9 (𝜑 → (𝑧𝐹𝑢 ↔ ∃𝑥𝑋 (𝑧 = 𝐴𝑢 = 𝐵)))
372, 9, 10fliftel 5484 . . . . . . . . . 10 (𝜑 → (𝑧𝐹𝑣 ↔ ∃𝑥𝑋 (𝑧 = 𝐴𝑣 = 𝐵)))
3818eqeq2d 2094 . . . . . . . . . . . 12 (𝑥 = 𝑦 → (𝑧 = 𝐴𝑧 = 𝐶))
3920eqeq2d 2094 . . . . . . . . . . . 12 (𝑥 = 𝑦 → (𝑣 = 𝐵𝑣 = 𝐷))
4038, 39anbi12d 457 . . . . . . . . . . 11 (𝑥 = 𝑦 → ((𝑧 = 𝐴𝑣 = 𝐵) ↔ (𝑧 = 𝐶𝑣 = 𝐷)))
4140cbvrexv 2583 . . . . . . . . . 10 (∃𝑥𝑋 (𝑧 = 𝐴𝑣 = 𝐵) ↔ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷))
4237, 41syl6bb 194 . . . . . . . . 9 (𝜑 → (𝑧𝐹𝑣 ↔ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷)))
4336, 42anbi12d 457 . . . . . . . 8 (𝜑 → ((𝑧𝐹𝑢𝑧𝐹𝑣) ↔ (∃𝑥𝑋 (𝑧 = 𝐴𝑢 = 𝐵) ∧ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷))))
4443biimpd 142 . . . . . . 7 (𝜑 → ((𝑧𝐹𝑢𝑧𝐹𝑣) → (∃𝑥𝑋 (𝑧 = 𝐴𝑢 = 𝐵) ∧ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷))))
45 reeanv 2528 . . . . . . . 8 (∃𝑥𝑋𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷)) ↔ (∃𝑥𝑋 (𝑧 = 𝐴𝑢 = 𝐵) ∧ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷)))
46 r19.29 2499 . . . . . . . . . 10 ((∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑥𝑋𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → ∃𝑥𝑋 (∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))))
47 r19.29 2499 . . . . . . . . . . . 12 ((∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → ∃𝑦𝑋 ((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))))
48 eqtr2 2101 . . . . . . . . . . . . . . . . 17 ((𝑧 = 𝐴𝑧 = 𝐶) → 𝐴 = 𝐶)
4948ad2ant2r 493 . . . . . . . . . . . . . . . 16 (((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷)) → 𝐴 = 𝐶)
5049imim1i 59 . . . . . . . . . . . . . . 15 ((𝐴 = 𝐶𝐵 = 𝐷) → (((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷)) → 𝐵 = 𝐷))
5150imp 122 . . . . . . . . . . . . . 14 (((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝐵 = 𝐷)
52 simprlr 505 . . . . . . . . . . . . . 14 (((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝐵)
53 simprrr 507 . . . . . . . . . . . . . 14 (((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑣 = 𝐷)
5451, 52, 533eqtr4d 2125 . . . . . . . . . . . . 13 (((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝑣)
5554rexlimivw 2478 . . . . . . . . . . . 12 (∃𝑦𝑋 ((𝐴 = 𝐶𝐵 = 𝐷) ∧ ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝑣)
5647, 55syl 14 . . . . . . . . . . 11 ((∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝑣)
5756rexlimivw 2478 . . . . . . . . . 10 (∃𝑥𝑋 (∀𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝑣)
5846, 57syl 14 . . . . . . . . 9 ((∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) ∧ ∃𝑥𝑋𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷))) → 𝑢 = 𝑣)
5958ex 113 . . . . . . . 8 (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → (∃𝑥𝑋𝑦𝑋 ((𝑧 = 𝐴𝑢 = 𝐵) ∧ (𝑧 = 𝐶𝑣 = 𝐷)) → 𝑢 = 𝑣))
6045, 59syl5bir 151 . . . . . . 7 (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → ((∃𝑥𝑋 (𝑧 = 𝐴𝑢 = 𝐵) ∧ ∃𝑦𝑋 (𝑧 = 𝐶𝑣 = 𝐷)) → 𝑢 = 𝑣))
6144, 60syl9 71 . . . . . 6 (𝜑 → (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → ((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
6261alrimdv 1799 . . . . 5 (𝜑 → (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → ∀𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
6362alrimdv 1799 . . . 4 (𝜑 → (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → ∀𝑢𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
6463alrimdv 1799 . . 3 (𝜑 → (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → ∀𝑧𝑢𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
652, 9, 10fliftrel 5483 . . . . 5 (𝜑𝐹 ⊆ (𝑅 × 𝑆))
66 relxp 4495 . . . . 5 Rel (𝑅 × 𝑆)
67 relss 4473 . . . . 5 (𝐹 ⊆ (𝑅 × 𝑆) → (Rel (𝑅 × 𝑆) → Rel 𝐹))
6865, 66, 67mpisyl 1376 . . . 4 (𝜑 → Rel 𝐹)
69 dffun2 4962 . . . . 5 (Fun 𝐹 ↔ (Rel 𝐹 ∧ ∀𝑧𝑢𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
7069baib 862 . . . 4 (Rel 𝐹 → (Fun 𝐹 ↔ ∀𝑧𝑢𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
7168, 70syl 14 . . 3 (𝜑 → (Fun 𝐹 ↔ ∀𝑧𝑢𝑣((𝑧𝐹𝑢𝑧𝐹𝑣) → 𝑢 = 𝑣)))
7264, 71sylibrd 167 . 2 (𝜑 → (∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷) → Fun 𝐹))
7335, 72impbid 127 1 (𝜑 → (Fun 𝐹 ↔ ∀𝑥𝑋𝑦𝑋 (𝐴 = 𝐶𝐵 = 𝐷)))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wb 103  wal 1283   = wceq 1285  wcel 1434  wral 2353  wrex 2354  wss 2982  cop 3419   class class class wbr 3805  cmpt 3859   × cxp 4389  ran crn 4392  Rel wrel 4396  Fun wfun 4946  cfv 4952
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-14 1446  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065  ax-sep 3916  ax-pow 3968  ax-pr 3992
This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1688  df-eu 1946  df-mo 1947  df-clab 2070  df-cleq 2076  df-clel 2079  df-nfc 2212  df-ral 2358  df-rex 2359  df-rab 2362  df-v 2612  df-sbc 2825  df-csb 2918  df-un 2986  df-in 2988  df-ss 2995  df-pw 3402  df-sn 3422  df-pr 3423  df-op 3425  df-uni 3622  df-br 3806  df-opab 3860  df-mpt 3861  df-id 4076  df-xp 4397  df-rel 4398  df-cnv 4399  df-co 4400  df-dm 4401  df-rn 4402  df-res 4403  df-ima 4404  df-iota 4917  df-fun 4954  df-fn 4955  df-f 4956  df-fv 4960
This theorem is referenced by:  fliftfund  5488  fliftfuns  5489  qliftfun  6275
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