Theorem riotass2 7384

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	⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → (℩𝑥 ∈ 𝐴 𝜑) = (℩𝑥 ∈ 𝐵 𝜓))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)

Proof of Theorem riotass2

Step	Hyp	Ref	Expression
1		reuss2 4279	. . . 4 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → ∃!𝑥 ∈ 𝐴 𝜑)
2		simplr 778	. . . 4 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓))
3		riotasbc 7372	. . . . 5 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜑)
4		riotacl 7371	. . . . . 6 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 → (℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴)
5		rspsbc 3833	. . . . . . 7 ⊢ ((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝜑 → 𝜓) → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥](𝜑 → 𝜓)))
6		sbcimg 3793	. . . . . . 7 ⊢ ((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴 → ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥](𝜑 → 𝜓) ↔ ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜑 → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓)))
7	5, 6	sylibd 241	. . . . . 6 ⊢ ((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝜑 → 𝜓) → ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜑 → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓)))
8	4, 7	syl 17	. . . . 5 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 → (∀𝑥 ∈ 𝐴 (𝜑 → 𝜓) → ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜑 → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓)))
9	3, 8	mpid 44	. . . 4 ⊢ (∃!𝑥 ∈ 𝐴 𝜑 → (∀𝑥 ∈ 𝐴 (𝜑 → 𝜓) → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓))
10	1, 2, 9	sylc 65	. . 3 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓)
11	1, 4	syl 17	. . . . 5 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → (℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴)
12		ssel 3931	. . . . . 6 ⊢ (𝐴 ⊆ 𝐵 → ((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴 → (℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐵))
13	12	ad2antrr 736	. . . . 5 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → ((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐴 → (℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐵))
14	11, 13	mpd 15	. . . 4 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → (℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐵)
15		simprr 782	. . . 4 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → ∃!𝑥 ∈ 𝐵 𝜓)
16		nfriota1 7361	. . . . 5 ⊢ Ⅎ𝑥(℩𝑥 ∈ 𝐴 𝜑)
17	16	nfsbc1 3764	. . . . 5 ⊢ Ⅎ𝑥[(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓
18		sbceq1a 3756	. . . . 5 ⊢ (𝑥 = (℩𝑥 ∈ 𝐴 𝜑) → (𝜓 ↔ [(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓))
19	16, 17, 18	riota2f 7378	. . . 4 ⊢ (((℩𝑥 ∈ 𝐴 𝜑) ∈ 𝐵 ∧ ∃!𝑥 ∈ 𝐵 𝜓) → ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓 ↔ (℩𝑥 ∈ 𝐵 𝜓) = (℩𝑥 ∈ 𝐴 𝜑)))
20	14, 15, 19	syl2anc 593	. . 3 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → ([(℩𝑥 ∈ 𝐴 𝜑) / 𝑥]𝜓 ↔ (℩𝑥 ∈ 𝐵 𝜓) = (℩𝑥 ∈ 𝐴 𝜑)))
21	10, 20	mpbid 234	. 2 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → (℩𝑥 ∈ 𝐵 𝜓) = (℩𝑥 ∈ 𝐴 𝜑))
22	21	eqcomd 2769	1 ⊢ (((𝐴 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 (𝜑 → 𝜓)) ∧ (∃𝑥 ∈ 𝐴 𝜑 ∧ ∃!𝑥 ∈ 𝐵 𝜓)) → (℩𝑥 ∈ 𝐴 𝜑) = (℩𝑥 ∈ 𝐵 𝜓))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 399   = wceq 1561   ∈ wcel 2143  ∀wral 3077  ∃wrex 3087  ∃!wreu 3366  [wsbc 3745   ⊆ wss 3905  ℩crio 7353

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1816  ax-4 1830  ax-5 1931  ax-6 1988  ax-7 2029  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1564  df-ex 1801  df-nf 1805  df-sb 2092  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3078  df-rex 3088  df-reu 3369  df-rab 3416  df-v 3457  df-sbc 3746  df-un 3910  df-ss 3922  df-sn 4584  df-pr 4586  df-uni 4867  df-iota 6478  df-riota 7354

This theorem is referenced by:  fisupcl  9417  quotlem  26365  adjbdln  32287  rexdiv  33104  cdlemefrs32fva  41025  addinvcom  43042