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Theorem fipwssg 6952
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.)
Assertion
Ref Expression
fipwssg ((𝐴𝑉𝐴 ⊆ 𝒫 𝑋) → (fi‘𝐴) ⊆ 𝒫 𝑋)

Proof of Theorem fipwssg
StepHypRef Expression
1 fiuni 6951 . . . 4 (𝐴𝑉 𝐴 = (fi‘𝐴))
21sseq1d 3176 . . 3 (𝐴𝑉 → ( 𝐴𝑋 (fi‘𝐴) ⊆ 𝑋))
3 sspwuni 3955 . . 3 (𝐴 ⊆ 𝒫 𝑋 𝐴𝑋)
4 sspwuni 3955 . . 3 ((fi‘𝐴) ⊆ 𝒫 𝑋 (fi‘𝐴) ⊆ 𝑋)
52, 3, 43bitr4g 222 . 2 (𝐴𝑉 → (𝐴 ⊆ 𝒫 𝑋 ↔ (fi‘𝐴) ⊆ 𝒫 𝑋))
65biimpa 294 1 ((𝐴𝑉𝐴 ⊆ 𝒫 𝑋) → (fi‘𝐴) ⊆ 𝒫 𝑋)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wcel 2141  wss 3121  𝒫 cpw 3564   cuni 3794  cfv 5196  ficfi 6941
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4105  ax-nul 4113  ax-pow 4158  ax-pr 4192  ax-un 4416  ax-iinf 4570
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-ral 2453  df-rex 2454  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3566  df-sn 3587  df-pr 3588  df-op 3590  df-uni 3795  df-int 3830  df-br 3988  df-opab 4049  df-mpt 4050  df-id 4276  df-suc 4354  df-iom 4573  df-xp 4615  df-rel 4616  df-cnv 4617  df-co 4618  df-dm 4619  df-rn 4620  df-res 4621  df-ima 4622  df-iota 5158  df-fun 5198  df-fn 5199  df-f 5200  df-f1 5201  df-fo 5202  df-f1o 5203  df-fv 5204  df-1o 6392  df-er 6509  df-en 6715  df-fin 6717  df-fi 6942
This theorem is referenced by: (None)
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