Theorem sbcfung 6509

Description: Distribute proper substitution through the function predicate. (Contributed by Alexander van der Vekens, 23-Jul-2017.)

Assertion

Ref	Expression
sbcfung	⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]Fun 𝐹 ↔ Fun ⦋𝐴 / 𝑥⦌𝐹))

Proof of Theorem sbcfung

Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		sbcan 3772	. . 3 ⊢ ([𝐴 / 𝑥](Rel 𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)) ↔ ([𝐴 / 𝑥]Rel 𝐹 ∧ [𝐴 / 𝑥]∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)))
2		sbcrel 5724	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]Rel 𝐹 ↔ Rel ⦋𝐴 / 𝑥⦌𝐹))
3		sbcal 3782	. . . . 5 ⊢ ([𝐴 / 𝑥]∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑤[𝐴 / 𝑥]∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦))
4		sbcex2 3783	. . . . . . 7 ⊢ ([𝐴 / 𝑥]∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∃𝑦[𝐴 / 𝑥]∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦))
5		sbcal 3782	. . . . . . . . 9 ⊢ ([𝐴 / 𝑥]∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑧[𝐴 / 𝑥](𝑤𝐹𝑧 → 𝑧 = 𝑦))
6		sbcimg 3771	. . . . . . . . . . 11 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥](𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ([𝐴 / 𝑥]𝑤𝐹𝑧 → [𝐴 / 𝑥]𝑧 = 𝑦)))
7		sbcbr123 5126	. . . . . . . . . . . . 13 ⊢ ([𝐴 / 𝑥]𝑤𝐹𝑧 ↔ ⦋𝐴 / 𝑥⦌𝑤⦋𝐴 / 𝑥⦌𝐹⦋𝐴 / 𝑥⦌𝑧)
8		csbconstg 3850	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌𝑤 = 𝑤)
9		csbconstg 3850	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ 𝑉 → ⦋𝐴 / 𝑥⦌𝑧 = 𝑧)
10	8, 9	breq12d 5085	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ 𝑉 → (⦋𝐴 / 𝑥⦌𝑤⦋𝐴 / 𝑥⦌𝐹⦋𝐴 / 𝑥⦌𝑧 ↔ 𝑤⦋𝐴 / 𝑥⦌𝐹𝑧))
11	7, 10	bitrid 284	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]𝑤𝐹𝑧 ↔ 𝑤⦋𝐴 / 𝑥⦌𝐹𝑧))
12		sbcg 3795	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]𝑧 = 𝑦 ↔ 𝑧 = 𝑦))
13	11, 12	imbi12d 345	. . . . . . . . . . 11 ⊢ (𝐴 ∈ 𝑉 → (([𝐴 / 𝑥]𝑤𝐹𝑧 → [𝐴 / 𝑥]𝑧 = 𝑦) ↔ (𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
14	6, 13	bitrd 280	. . . . . . . . . 10 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥](𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ (𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
15	14	albidv 1927	. . . . . . . . 9 ⊢ (𝐴 ∈ 𝑉 → (∀𝑧[𝐴 / 𝑥](𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
16	5, 15	bitrid 284	. . . . . . . 8 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
17	16	exbidv 1928	. . . . . . 7 ⊢ (𝐴 ∈ 𝑉 → (∃𝑦[𝐴 / 𝑥]∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
18	4, 17	bitrid 284	. . . . . 6 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
19	18	albidv 1927	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → (∀𝑤[𝐴 / 𝑥]∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑤∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
20	3, 19	bitrid 284	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦) ↔ ∀𝑤∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
21	2, 20	anbi12d 638	. . 3 ⊢ (𝐴 ∈ 𝑉 → (([𝐴 / 𝑥]Rel 𝐹 ∧ [𝐴 / 𝑥]∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)) ↔ (Rel ⦋𝐴 / 𝑥⦌𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦))))
22	1, 21	bitrid 284	. 2 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥](Rel 𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)) ↔ (Rel ⦋𝐴 / 𝑥⦌𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦))))
23		dffun3 6497	. . 3 ⊢ (Fun 𝐹 ↔ (Rel 𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)))
24	23	sbcbii 3779	. 2 ⊢ ([𝐴 / 𝑥]Fun 𝐹 ↔ [𝐴 / 𝑥](Rel 𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤𝐹𝑧 → 𝑧 = 𝑦)))
25		dffun3 6497	. 2 ⊢ (Fun ⦋𝐴 / 𝑥⦌𝐹 ↔ (Rel ⦋𝐴 / 𝑥⦌𝐹 ∧ ∀𝑤∃𝑦∀𝑧(𝑤⦋𝐴 / 𝑥⦌𝐹𝑧 → 𝑧 = 𝑦)))
26	22, 24, 25	3bitr4g 315	1 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]Fun 𝐹 ↔ Fun ⦋𝐴 / 𝑥⦌𝐹))

Syntax hints:   → wi 4   ↔ wb 207   ∧ wa 396  ∀wal 1545  ∃wex 1786   ∈ wcel 2119  [wsbc 3723  ⦋csb 3831   class class class wbr 5072  Rel wrel 5623  Fun wfun 6479

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-pr 5362

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-sbc 3724  df-csb 3832  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-id 5513  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-fun 6487

This theorem is referenced by:  sbcfng  6652  esum2dlem  34276