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Theorem riotass2 5856
Description: Restriction of a unique element to a smaller class. (Contributed by NM, 21-Aug-2011.) (Revised by NM, 22-Mar-2013.)
Assertion
Ref Expression
riotass2 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → (𝑥𝐴 𝜑) = (𝑥𝐵 𝜓))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)

Proof of Theorem riotass2
StepHypRef Expression
1 reuss2 3415 . . . 4 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → ∃!𝑥𝐴 𝜑)
2 simplr 528 . . . 4 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → ∀𝑥𝐴 (𝜑𝜓))
3 riotasbc 5845 . . . . 5 (∃!𝑥𝐴 𝜑[(𝑥𝐴 𝜑) / 𝑥]𝜑)
4 riotacl 5844 . . . . . 6 (∃!𝑥𝐴 𝜑 → (𝑥𝐴 𝜑) ∈ 𝐴)
5 rspsbc 3045 . . . . . . 7 ((𝑥𝐴 𝜑) ∈ 𝐴 → (∀𝑥𝐴 (𝜑𝜓) → [(𝑥𝐴 𝜑) / 𝑥](𝜑𝜓)))
6 sbcimg 3004 . . . . . . 7 ((𝑥𝐴 𝜑) ∈ 𝐴 → ([(𝑥𝐴 𝜑) / 𝑥](𝜑𝜓) ↔ ([(𝑥𝐴 𝜑) / 𝑥]𝜑[(𝑥𝐴 𝜑) / 𝑥]𝜓)))
75, 6sylibd 149 . . . . . 6 ((𝑥𝐴 𝜑) ∈ 𝐴 → (∀𝑥𝐴 (𝜑𝜓) → ([(𝑥𝐴 𝜑) / 𝑥]𝜑[(𝑥𝐴 𝜑) / 𝑥]𝜓)))
84, 7syl 14 . . . . 5 (∃!𝑥𝐴 𝜑 → (∀𝑥𝐴 (𝜑𝜓) → ([(𝑥𝐴 𝜑) / 𝑥]𝜑[(𝑥𝐴 𝜑) / 𝑥]𝜓)))
93, 8mpid 42 . . . 4 (∃!𝑥𝐴 𝜑 → (∀𝑥𝐴 (𝜑𝜓) → [(𝑥𝐴 𝜑) / 𝑥]𝜓))
101, 2, 9sylc 62 . . 3 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → [(𝑥𝐴 𝜑) / 𝑥]𝜓)
111, 4syl 14 . . . . 5 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → (𝑥𝐴 𝜑) ∈ 𝐴)
12 ssel 3149 . . . . . 6 (𝐴𝐵 → ((𝑥𝐴 𝜑) ∈ 𝐴 → (𝑥𝐴 𝜑) ∈ 𝐵))
1312ad2antrr 488 . . . . 5 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → ((𝑥𝐴 𝜑) ∈ 𝐴 → (𝑥𝐴 𝜑) ∈ 𝐵))
1411, 13mpd 13 . . . 4 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → (𝑥𝐴 𝜑) ∈ 𝐵)
15 simprr 531 . . . 4 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → ∃!𝑥𝐵 𝜓)
16 nfriota1 5837 . . . . 5 𝑥(𝑥𝐴 𝜑)
1716nfsbc1 2980 . . . . 5 𝑥[(𝑥𝐴 𝜑) / 𝑥]𝜓
18 sbceq1a 2972 . . . . 5 (𝑥 = (𝑥𝐴 𝜑) → (𝜓[(𝑥𝐴 𝜑) / 𝑥]𝜓))
1916, 17, 18riota2f 5851 . . . 4 (((𝑥𝐴 𝜑) ∈ 𝐵 ∧ ∃!𝑥𝐵 𝜓) → ([(𝑥𝐴 𝜑) / 𝑥]𝜓 ↔ (𝑥𝐵 𝜓) = (𝑥𝐴 𝜑)))
2014, 15, 19syl2anc 411 . . 3 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → ([(𝑥𝐴 𝜑) / 𝑥]𝜓 ↔ (𝑥𝐵 𝜓) = (𝑥𝐴 𝜑)))
2110, 20mpbid 147 . 2 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → (𝑥𝐵 𝜓) = (𝑥𝐴 𝜑))
2221eqcomd 2183 1 (((𝐴𝐵 ∧ ∀𝑥𝐴 (𝜑𝜓)) ∧ (∃𝑥𝐴 𝜑 ∧ ∃!𝑥𝐵 𝜓)) → (𝑥𝐴 𝜑) = (𝑥𝐵 𝜓))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1353  wcel 2148  wral 2455  wrex 2456  ∃!wreu 2457  [wsbc 2962  wss 3129  crio 5829
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-reu 2462  df-rab 2464  df-v 2739  df-sbc 2963  df-un 3133  df-in 3135  df-ss 3142  df-sn 3598  df-pr 3599  df-uni 3810  df-iota 5178  df-riota 5830
This theorem is referenced by: (None)
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