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| Mirrors > Home > MPE Home > Th. List > Mathboxes > restsubel | Structured version Visualization version GIF version | ||
| Description: A subset belongs in the space it generates via restriction. (Contributed by Glauco Siliprandi, 21-Dec-2024.) |
| Ref | Expression |
|---|---|
| restsubel.1 | ⊢ (𝜑 → 𝐽 ∈ 𝑉) |
| restsubel.2 | ⊢ (𝜑 → ∪ 𝐽 ∈ 𝐽) |
| restsubel.3 | ⊢ (𝜑 → 𝐴 ⊆ ∪ 𝐽) |
| Ref | Expression |
|---|---|
| restsubel | ⊢ (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | restsubel.2 | . . 3 ⊢ (𝜑 → ∪ 𝐽 ∈ 𝐽) | |
| 2 | ineq1 4110 | . . . . 5 ⊢ (𝑥 = ∪ 𝐽 → (𝑥 ∩ 𝐴) = (∪ 𝐽 ∩ 𝐴)) | |
| 3 | 2 | eqeq2d 2771 | . . . 4 ⊢ (𝑥 = ∪ 𝐽 → (𝐴 = (𝑥 ∩ 𝐴) ↔ 𝐴 = (∪ 𝐽 ∩ 𝐴))) |
| 4 | 3 | adantl 487 | . . 3 ⊢ ((𝜑 ∧ 𝑥 = ∪ 𝐽) → (𝐴 = (𝑥 ∩ 𝐴) ↔ 𝐴 = (∪ 𝐽 ∩ 𝐴))) |
| 5 | incom 4106 | . . . . . 6 ⊢ (∪ 𝐽 ∩ 𝐴) = (𝐴 ∩ ∪ 𝐽) | |
| 6 | 5 | a1i 11 | . . . . 5 ⊢ (𝜑 → (∪ 𝐽 ∩ 𝐴) = (𝐴 ∩ ∪ 𝐽)) |
| 7 | restsubel.3 | . . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ ∪ 𝐽) | |
| 8 | dfss2 4094 | . . . . . 6 ⊢ (𝐴 ⊆ ∪ 𝐽 ↔ (𝐴 ∩ ∪ 𝐽) = 𝐴) | |
| 9 | 7, 8 | sylib 221 | . . . . 5 ⊢ (𝜑 → (𝐴 ∩ ∪ 𝐽) = 𝐴) |
| 10 | 6, 9 | eqtrd 2795 | . . . 4 ⊢ (𝜑 → (∪ 𝐽 ∩ 𝐴) = 𝐴) |
| 11 | 10 | eqcomd 2766 | . . 3 ⊢ (𝜑 → 𝐴 = (∪ 𝐽 ∩ 𝐴)) |
| 12 | 1, 4, 11 | rspcedvd 3578 | . 2 ⊢ (𝜑 → ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴)) |
| 13 | restsubel.1 | . . 3 ⊢ (𝜑 → 𝐽 ∈ 𝑉) | |
| 14 | 1, 7 | ssexd 5285 | . . 3 ⊢ (𝜑 → 𝐴 ∈ V) |
| 15 | elrest 17604 | . . 3 ⊢ ((𝐽 ∈ 𝑉 ∧ 𝐴 ∈ V) → (𝐴 ∈ (𝐽 ↾t 𝐴) ↔ ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴))) | |
| 16 | 13, 14, 15 | syl2anc 596 | . 2 ⊢ (𝜑 → (𝐴 ∈ (𝐽 ↾t 𝐴) ↔ ∃𝑥 ∈ 𝐽 𝐴 = (𝑥 ∩ 𝐴))) |
| 17 | 12, 16 | mpbird 260 | 1 ⊢ (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 = wceq 1569 ∈ wcel 2144 ∃wrex 3086 Vcvv 3450 ⊆ wss 3895 ∩ cin 4089 ∪ cuni 4866 (class class class)co 7421 ↾t crest 17597 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-ov 7424 df-oprab 7425 df-mpo 7426 df-rest 17599 |
| This theorem is used by: toprestsubel 46263 |
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