Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > funcnv4mpt | Structured version Visualization version GIF version |
Description: Two ways to say that a function in maps-to notation is single-rooted. (Contributed by Thierry Arnoux, 2-Mar-2017.) |
Ref | Expression |
---|---|
funcnvmpt.0 | ⊢ Ⅎ𝑥𝜑 |
funcnvmpt.1 | ⊢ Ⅎ𝑥𝐴 |
funcnvmpt.2 | ⊢ Ⅎ𝑥𝐹 |
funcnvmpt.3 | ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) |
funcnvmpt.4 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉) |
Ref | Expression |
---|---|
funcnv4mpt | ⊢ (𝜑 → (Fun ◡𝐹 ↔ ∀𝑖 ∈ 𝐴 ∀𝑗 ∈ 𝐴 (𝑖 = 𝑗 ∨ ⦋𝑖 / 𝑥⦌𝐵 ≠ ⦋𝑗 / 𝑥⦌𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1917 | . 2 ⊢ Ⅎ𝑖𝜑 | |
2 | nfcv 2907 | . 2 ⊢ Ⅎ𝑖𝐴 | |
3 | nfcv 2907 | . 2 ⊢ Ⅎ𝑖𝐹 | |
4 | funcnvmpt.3 | . . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
5 | funcnvmpt.1 | . . . 4 ⊢ Ⅎ𝑥𝐴 | |
6 | nfcv 2907 | . . . 4 ⊢ Ⅎ𝑖𝐵 | |
7 | nfcsb1v 3857 | . . . 4 ⊢ Ⅎ𝑥⦋𝑖 / 𝑥⦌𝐵 | |
8 | csbeq1a 3846 | . . . 4 ⊢ (𝑥 = 𝑖 → 𝐵 = ⦋𝑖 / 𝑥⦌𝐵) | |
9 | 5, 2, 6, 7, 8 | cbvmptf 5183 | . . 3 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑖 ∈ 𝐴 ↦ ⦋𝑖 / 𝑥⦌𝐵) |
10 | 4, 9 | eqtri 2766 | . 2 ⊢ 𝐹 = (𝑖 ∈ 𝐴 ↦ ⦋𝑖 / 𝑥⦌𝐵) |
11 | funcnvmpt.4 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝑉) | |
12 | 11 | sbimi 2077 | . . 3 ⊢ ([𝑖 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) → [𝑖 / 𝑥]𝐵 ∈ 𝑉) |
13 | funcnvmpt.0 | . . . . 5 ⊢ Ⅎ𝑥𝜑 | |
14 | nfcv 2907 | . . . . . 6 ⊢ Ⅎ𝑥𝑖 | |
15 | 14, 5 | nfel 2921 | . . . . 5 ⊢ Ⅎ𝑥 𝑖 ∈ 𝐴 |
16 | 13, 15 | nfan 1902 | . . . 4 ⊢ Ⅎ𝑥(𝜑 ∧ 𝑖 ∈ 𝐴) |
17 | eleq1w 2821 | . . . . 5 ⊢ (𝑥 = 𝑖 → (𝑥 ∈ 𝐴 ↔ 𝑖 ∈ 𝐴)) | |
18 | 17 | anbi2d 629 | . . . 4 ⊢ (𝑥 = 𝑖 → ((𝜑 ∧ 𝑥 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴))) |
19 | 16, 18 | sbiev 2309 | . . 3 ⊢ ([𝑖 / 𝑥](𝜑 ∧ 𝑥 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴)) |
20 | nfcv 2907 | . . . . 5 ⊢ Ⅎ𝑥𝑉 | |
21 | 7, 20 | nfel 2921 | . . . 4 ⊢ Ⅎ𝑥⦋𝑖 / 𝑥⦌𝐵 ∈ 𝑉 |
22 | 8 | eleq1d 2823 | . . . 4 ⊢ (𝑥 = 𝑖 → (𝐵 ∈ 𝑉 ↔ ⦋𝑖 / 𝑥⦌𝐵 ∈ 𝑉)) |
23 | 21, 22 | sbiev 2309 | . . 3 ⊢ ([𝑖 / 𝑥]𝐵 ∈ 𝑉 ↔ ⦋𝑖 / 𝑥⦌𝐵 ∈ 𝑉) |
24 | 12, 19, 23 | 3imtr3i 291 | . 2 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑥⦌𝐵 ∈ 𝑉) |
25 | csbeq1 3835 | . 2 ⊢ (𝑖 = 𝑗 → ⦋𝑖 / 𝑥⦌𝐵 = ⦋𝑗 / 𝑥⦌𝐵) | |
26 | 1, 2, 3, 10, 24, 25 | funcnv5mpt 31005 | 1 ⊢ (𝜑 → (Fun ◡𝐹 ↔ ∀𝑖 ∈ 𝐴 ∀𝑗 ∈ 𝐴 (𝑖 = 𝑗 ∨ ⦋𝑖 / 𝑥⦌𝐵 ≠ ⦋𝑗 / 𝑥⦌𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 844 = wceq 1539 Ⅎwnf 1786 [wsb 2067 ∈ wcel 2106 Ⅎwnfc 2887 ≠ wne 2943 ∀wral 3064 ⦋csb 3832 ↦ cmpt 5157 ◡ccnv 5588 Fun wfun 6427 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pr 5352 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-ral 3069 df-rex 3070 df-rmo 3071 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-br 5075 df-opab 5137 df-mpt 5158 df-id 5489 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-iota 6391 df-fun 6435 df-fn 6436 df-fv 6441 |
This theorem is referenced by: disjdsct 31035 |
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