Theorem bnj976 34792

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)

Hypotheses

Ref	Expression
bnj976.1	⊢ (𝜒 ↔ (𝑁 ∈ 𝐷 ∧ 𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓))
bnj976.2	⊢ (𝜑′ ↔ [𝐺 / 𝑓]𝜑)
bnj976.3	⊢ (𝜓′ ↔ [𝐺 / 𝑓]𝜓)
bnj976.4	⊢ (𝜒′ ↔ [𝐺 / 𝑓]𝜒)
bnj976.5	⊢ 𝐺 ∈ V

Assertion

Ref	Expression
bnj976	⊢ (𝜒′ ↔ (𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′))

Distinct variable groups:   𝐷,𝑓   𝑓,𝑁

Allowed substitution hints:   𝜑(𝑓)   𝜓(𝑓)   𝜒(𝑓)   𝐺(𝑓)   𝜑′(𝑓)   𝜓′(𝑓)   𝜒′(𝑓)

Proof of Theorem bnj976

Dummy variable ℎ is distinct from all other variables.

Step	Hyp	Ref	Expression
1		bnj976.4	. 2 ⊢ (𝜒′ ↔ [𝐺 / 𝑓]𝜒)
2		sbccow 3810	. 2 ⊢ ([𝐺 / ℎ][ℎ / 𝑓]𝜒 ↔ [𝐺 / 𝑓]𝜒)
3		bnj976.5	. . 3 ⊢ 𝐺 ∈ V
4		bnj252 34718	. . . . . 6 ⊢ ((𝑁 ∈ 𝐷 ∧ 𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓) ↔ (𝑁 ∈ 𝐷 ∧ (𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)))
5	4	sbcbii 3845	. . . . 5 ⊢ ([ℎ / 𝑓](𝑁 ∈ 𝐷 ∧ 𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓) ↔ [ℎ / 𝑓](𝑁 ∈ 𝐷 ∧ (𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)))
6		bnj976.1	. . . . . 6 ⊢ (𝜒 ↔ (𝑁 ∈ 𝐷 ∧ 𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓))
7	6	sbcbii 3845	. . . . 5 ⊢ ([ℎ / 𝑓]𝜒 ↔ [ℎ / 𝑓](𝑁 ∈ 𝐷 ∧ 𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓))
8		vex 3483	. . . . . . . 8 ⊢ ℎ ∈ V
9	8	bnj525 34753	. . . . . . 7 ⊢ ([ℎ / 𝑓]𝑁 ∈ 𝐷 ↔ 𝑁 ∈ 𝐷)
10		sbc3an 3854	. . . . . . . 8 ⊢ ([ℎ / 𝑓](𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓) ↔ ([ℎ / 𝑓]𝑓 Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓))
11		bnj62 34735	. . . . . . . . 9 ⊢ ([ℎ / 𝑓]𝑓 Fn 𝑁 ↔ ℎ Fn 𝑁)
12	11	3anbi1i 1157	. . . . . . . 8 ⊢ (([ℎ / 𝑓]𝑓 Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓) ↔ (ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓))
13	10, 12	bitri 275	. . . . . . 7 ⊢ ([ℎ / 𝑓](𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓) ↔ (ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓))
14	9, 13	anbi12i 628	. . . . . 6 ⊢ (([ℎ / 𝑓]𝑁 ∈ 𝐷 ∧ [ℎ / 𝑓](𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)) ↔ (𝑁 ∈ 𝐷 ∧ (ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓)))
15		sbcan 3837	. . . . . 6 ⊢ ([ℎ / 𝑓](𝑁 ∈ 𝐷 ∧ (𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)) ↔ ([ℎ / 𝑓]𝑁 ∈ 𝐷 ∧ [ℎ / 𝑓](𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)))
16		bnj252 34718	. . . . . 6 ⊢ ((𝑁 ∈ 𝐷 ∧ ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓) ↔ (𝑁 ∈ 𝐷 ∧ (ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓)))
17	14, 15, 16	3bitr4ri 304	. . . . 5 ⊢ ((𝑁 ∈ 𝐷 ∧ ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓) ↔ [ℎ / 𝑓](𝑁 ∈ 𝐷 ∧ (𝑓 Fn 𝑁 ∧ 𝜑 ∧ 𝜓)))
18	5, 7, 17	3bitr4i 303	. . . 4 ⊢ ([ℎ / 𝑓]𝜒 ↔ (𝑁 ∈ 𝐷 ∧ ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓))
19		fneq1 6658	. . . . . . 7 ⊢ (ℎ = 𝐺 → (ℎ Fn 𝑁 ↔ 𝐺 Fn 𝑁))
20		sbceq1a 3798	. . . . . . . 8 ⊢ (ℎ = 𝐺 → ([ℎ / 𝑓]𝜑 ↔ [𝐺 / ℎ][ℎ / 𝑓]𝜑))
21		bnj976.2	. . . . . . . . 9 ⊢ (𝜑′ ↔ [𝐺 / 𝑓]𝜑)
22		sbccow 3810	. . . . . . . . 9 ⊢ ([𝐺 / ℎ][ℎ / 𝑓]𝜑 ↔ [𝐺 / 𝑓]𝜑)
23	21, 22	bitr4i 278	. . . . . . . 8 ⊢ (𝜑′ ↔ [𝐺 / ℎ][ℎ / 𝑓]𝜑)
24	20, 23	bitr4di 289	. . . . . . 7 ⊢ (ℎ = 𝐺 → ([ℎ / 𝑓]𝜑 ↔ 𝜑′))
25		sbceq1a 3798	. . . . . . . 8 ⊢ (ℎ = 𝐺 → ([ℎ / 𝑓]𝜓 ↔ [𝐺 / ℎ][ℎ / 𝑓]𝜓))
26		bnj976.3	. . . . . . . . 9 ⊢ (𝜓′ ↔ [𝐺 / 𝑓]𝜓)
27		sbccow 3810	. . . . . . . . 9 ⊢ ([𝐺 / ℎ][ℎ / 𝑓]𝜓 ↔ [𝐺 / 𝑓]𝜓)
28	26, 27	bitr4i 278	. . . . . . . 8 ⊢ (𝜓′ ↔ [𝐺 / ℎ][ℎ / 𝑓]𝜓)
29	25, 28	bitr4di 289	. . . . . . 7 ⊢ (ℎ = 𝐺 → ([ℎ / 𝑓]𝜓 ↔ 𝜓′))
30	19, 24, 29	3anbi123d 1437	. . . . . 6 ⊢ (ℎ = 𝐺 → ((ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓) ↔ (𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′)))
31	30	anbi2d 630	. . . . 5 ⊢ (ℎ = 𝐺 → ((𝑁 ∈ 𝐷 ∧ (ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓)) ↔ (𝑁 ∈ 𝐷 ∧ (𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′))))
32		bnj252 34718	. . . . 5 ⊢ ((𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′) ↔ (𝑁 ∈ 𝐷 ∧ (𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′)))
33	31, 16, 32	3bitr4g 314	. . . 4 ⊢ (ℎ = 𝐺 → ((𝑁 ∈ 𝐷 ∧ ℎ Fn 𝑁 ∧ [ℎ / 𝑓]𝜑 ∧ [ℎ / 𝑓]𝜓) ↔ (𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′)))
34	18, 33	bitrid 283	. . 3 ⊢ (ℎ = 𝐺 → ([ℎ / 𝑓]𝜒 ↔ (𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′)))
35	3, 34	sbcie 3829	. 2 ⊢ ([𝐺 / ℎ][ℎ / 𝑓]𝜒 ↔ (𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′))
36	1, 2, 35	3bitr2i 299	1 ⊢ (𝜒′ ↔ (𝑁 ∈ 𝐷 ∧ 𝐺 Fn 𝑁 ∧ 𝜑′ ∧ 𝜓′))

Syntax hints:   ↔ wb 206   ∧ wa 395   ∧ w3a 1086   = wceq 1539   ∈ wcel 2107  Vcvv 3479  [wsbc 3787   Fn wfn 6555   ∧ w-bnj17 34701

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-12 2176  ax-ext 2707

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2714  df-cleq 2728  df-clel 2815  df-rab 3436  df-v 3481  df-sbc 3788  df-dif 3953  df-un 3955  df-ss 3967  df-nul 4333  df-if 4525  df-sn 4626  df-pr 4628  df-op 4632  df-br 5143  df-opab 5205  df-rel 5691  df-cnv 5692  df-co 5693  df-dm 5694  df-fun 6562  df-fn 6563  df-bnj17 34702

This theorem is referenced by:  bnj910  34963  bnj999  34973  bnj907  34982