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Mirrors > Home > MPE Home > Th. List > fipwss | Structured version Visualization version GIF version |
Description: If a set is a family of subsets of some base set, then so is its finite intersection. (Contributed by Stefan O'Rear, 2-Aug-2015.) |
Ref | Expression |
---|---|
fipwss | ⊢ (𝐴 ⊆ 𝒫 𝑋 → (fi‘𝐴) ⊆ 𝒫 𝑋) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fiuni 9187 | . . . . 5 ⊢ (𝐴 ∈ V → ∪ 𝐴 = ∪ (fi‘𝐴)) | |
2 | 1 | sseq1d 3952 | . . . 4 ⊢ (𝐴 ∈ V → (∪ 𝐴 ⊆ 𝑋 ↔ ∪ (fi‘𝐴) ⊆ 𝑋)) |
3 | sspwuni 5029 | . . . 4 ⊢ (𝐴 ⊆ 𝒫 𝑋 ↔ ∪ 𝐴 ⊆ 𝑋) | |
4 | sspwuni 5029 | . . . 4 ⊢ ((fi‘𝐴) ⊆ 𝒫 𝑋 ↔ ∪ (fi‘𝐴) ⊆ 𝑋) | |
5 | 2, 3, 4 | 3bitr4g 314 | . . 3 ⊢ (𝐴 ∈ V → (𝐴 ⊆ 𝒫 𝑋 ↔ (fi‘𝐴) ⊆ 𝒫 𝑋)) |
6 | 5 | biimpa 477 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐴 ⊆ 𝒫 𝑋) → (fi‘𝐴) ⊆ 𝒫 𝑋) |
7 | fvprc 6766 | . . . 4 ⊢ (¬ 𝐴 ∈ V → (fi‘𝐴) = ∅) | |
8 | 0ss 4330 | . . . 4 ⊢ ∅ ⊆ 𝒫 𝑋 | |
9 | 7, 8 | eqsstrdi 3975 | . . 3 ⊢ (¬ 𝐴 ∈ V → (fi‘𝐴) ⊆ 𝒫 𝑋) |
10 | 9 | adantr 481 | . 2 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐴 ⊆ 𝒫 𝑋) → (fi‘𝐴) ⊆ 𝒫 𝑋) |
11 | 6, 10 | pm2.61ian 809 | 1 ⊢ (𝐴 ⊆ 𝒫 𝑋 → (fi‘𝐴) ⊆ 𝒫 𝑋) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2106 Vcvv 3432 ⊆ wss 3887 ∅c0 4256 𝒫 cpw 4533 ∪ cuni 4839 ‘cfv 6433 ficfi 9169 |
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-pow 5288 ax-pr 5352 ax-un 7588 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 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-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 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-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-om 7713 df-1o 8297 df-er 8498 df-en 8734 df-fin 8737 df-fi 9170 |
This theorem is referenced by: fsubbas 23018 |
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