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Theorem fiss 7219
Description: Subset relationship for function fi. (Contributed by Jeff Hankins, 7-Oct-2009.) (Revised by Mario Carneiro, 24-Nov-2013.)
Assertion
Ref Expression
fiss ((𝐵𝑉𝐴𝐵) → (fi‘𝐴) ⊆ (fi‘𝐵))

Proof of Theorem fiss
Dummy variables 𝑟 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simpr 110 . . . 4 ((𝐵𝑉𝐴𝐵) → 𝐴𝐵)
2 sspwb 4314 . . . . 5 (𝐴𝐵 ↔ 𝒫 𝐴 ⊆ 𝒫 𝐵)
3 ssrin 3434 . . . . 5 (𝒫 𝐴 ⊆ 𝒫 𝐵 → (𝒫 𝐴 ∩ Fin) ⊆ (𝒫 𝐵 ∩ Fin))
42, 3sylbi 121 . . . 4 (𝐴𝐵 → (𝒫 𝐴 ∩ Fin) ⊆ (𝒫 𝐵 ∩ Fin))
5 ssrexv 3293 . . . 4 ((𝒫 𝐴 ∩ Fin) ⊆ (𝒫 𝐵 ∩ Fin) → (∃𝑥 ∈ (𝒫 𝐴 ∩ Fin)𝑟 = 𝑥 → ∃𝑥 ∈ (𝒫 𝐵 ∩ Fin)𝑟 = 𝑥))
61, 4, 53syl 17 . . 3 ((𝐵𝑉𝐴𝐵) → (∃𝑥 ∈ (𝒫 𝐴 ∩ Fin)𝑟 = 𝑥 → ∃𝑥 ∈ (𝒫 𝐵 ∩ Fin)𝑟 = 𝑥))
7 vex 2806 . . . 4 𝑟 ∈ V
8 simpl 109 . . . . 5 ((𝐵𝑉𝐴𝐵) → 𝐵𝑉)
98, 1ssexd 4234 . . . 4 ((𝐵𝑉𝐴𝐵) → 𝐴 ∈ V)
10 elfi 7213 . . . 4 ((𝑟 ∈ V ∧ 𝐴 ∈ V) → (𝑟 ∈ (fi‘𝐴) ↔ ∃𝑥 ∈ (𝒫 𝐴 ∩ Fin)𝑟 = 𝑥))
117, 9, 10sylancr 414 . . 3 ((𝐵𝑉𝐴𝐵) → (𝑟 ∈ (fi‘𝐴) ↔ ∃𝑥 ∈ (𝒫 𝐴 ∩ Fin)𝑟 = 𝑥))
12 elfi 7213 . . . . 5 ((𝑟 ∈ V ∧ 𝐵𝑉) → (𝑟 ∈ (fi‘𝐵) ↔ ∃𝑥 ∈ (𝒫 𝐵 ∩ Fin)𝑟 = 𝑥))
137, 12mpan 424 . . . 4 (𝐵𝑉 → (𝑟 ∈ (fi‘𝐵) ↔ ∃𝑥 ∈ (𝒫 𝐵 ∩ Fin)𝑟 = 𝑥))
1413adantr 276 . . 3 ((𝐵𝑉𝐴𝐵) → (𝑟 ∈ (fi‘𝐵) ↔ ∃𝑥 ∈ (𝒫 𝐵 ∩ Fin)𝑟 = 𝑥))
156, 11, 143imtr4d 203 . 2 ((𝐵𝑉𝐴𝐵) → (𝑟 ∈ (fi‘𝐴) → 𝑟 ∈ (fi‘𝐵)))
1615ssrdv 3234 1 ((𝐵𝑉𝐴𝐵) → (fi‘𝐴) ⊆ (fi‘𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1398  wcel 2202  wrex 2512  Vcvv 2803  cin 3200  wss 3201  𝒫 cpw 3656   cint 3933  cfv 5333  Fincfn 6952  ficfi 7210
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-nul 4220  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-iinf 4692
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-ral 2516  df-rex 2517  df-v 2805  df-sbc 3033  df-csb 3129  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-int 3934  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-suc 4474  df-iom 4695  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-fv 5341  df-er 6745  df-en 6953  df-fin 6955  df-fi 7211
This theorem is referenced by: (None)
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