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Theorem fiss 7094
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 4268 . . . . 5 (𝐴𝐵 ↔ 𝒫 𝐴 ⊆ 𝒫 𝐵)
3 ssrin 3402 . . . . 5 (𝒫 𝐴 ⊆ 𝒫 𝐵 → (𝒫 𝐴 ∩ Fin) ⊆ (𝒫 𝐵 ∩ Fin))
42, 3sylbi 121 . . . 4 (𝐴𝐵 → (𝒫 𝐴 ∩ Fin) ⊆ (𝒫 𝐵 ∩ Fin))
5 ssrexv 3262 . . . 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 2776 . . . 4 𝑟 ∈ V
8 simpl 109 . . . . 5 ((𝐵𝑉𝐴𝐵) → 𝐵𝑉)
98, 1ssexd 4192 . . . 4 ((𝐵𝑉𝐴𝐵) → 𝐴 ∈ V)
10 elfi 7088 . . . 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 7088 . . . . 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 3203 1 ((𝐵𝑉𝐴𝐵) → (fi‘𝐴) ⊆ (fi‘𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1373  wcel 2177  wrex 2486  Vcvv 2773  cin 3169  wss 3170  𝒫 cpw 3621   cint 3891  cfv 5280  Fincfn 6840  ficfi 7085
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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4170  ax-nul 4178  ax-pow 4226  ax-pr 4261  ax-un 4488  ax-iinf 4644
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ne 2378  df-ral 2490  df-rex 2491  df-v 2775  df-sbc 3003  df-csb 3098  df-dif 3172  df-un 3174  df-in 3176  df-ss 3183  df-nul 3465  df-pw 3623  df-sn 3644  df-pr 3645  df-op 3647  df-uni 3857  df-int 3892  df-br 4052  df-opab 4114  df-mpt 4115  df-id 4348  df-suc 4426  df-iom 4647  df-xp 4689  df-rel 4690  df-cnv 4691  df-co 4692  df-dm 4693  df-rn 4694  df-res 4695  df-ima 4696  df-iota 5241  df-fun 5282  df-fn 5283  df-f 5284  df-f1 5285  df-fo 5286  df-f1o 5287  df-fv 5288  df-er 6633  df-en 6841  df-fin 6843  df-fi 7086
This theorem is referenced by: (None)
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