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Theorem funpsstri 32256
Description: A condition for subset trichotomy for functions. (Contributed by Scott Fenton, 19-Apr-2011.)
Assertion
Ref Expression
funpsstri ((Fun 𝐻 ∧ (𝐹𝐻𝐺𝐻) ∧ (dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹)) → (𝐹𝐺𝐹 = 𝐺𝐺𝐹))

Proof of Theorem funpsstri
StepHypRef Expression
1 funssres 6178 . . . . . 6 ((Fun 𝐻𝐹𝐻) → (𝐻 ↾ dom 𝐹) = 𝐹)
21ex 403 . . . . 5 (Fun 𝐻 → (𝐹𝐻 → (𝐻 ↾ dom 𝐹) = 𝐹))
3 funssres 6178 . . . . . 6 ((Fun 𝐻𝐺𝐻) → (𝐻 ↾ dom 𝐺) = 𝐺)
43ex 403 . . . . 5 (Fun 𝐻 → (𝐺𝐻 → (𝐻 ↾ dom 𝐺) = 𝐺))
52, 4anim12d 602 . . . 4 (Fun 𝐻 → ((𝐹𝐻𝐺𝐻) → ((𝐻 ↾ dom 𝐹) = 𝐹 ∧ (𝐻 ↾ dom 𝐺) = 𝐺)))
6 ssres2 5674 . . . . . 6 (dom 𝐹 ⊆ dom 𝐺 → (𝐻 ↾ dom 𝐹) ⊆ (𝐻 ↾ dom 𝐺))
7 ssres2 5674 . . . . . 6 (dom 𝐺 ⊆ dom 𝐹 → (𝐻 ↾ dom 𝐺) ⊆ (𝐻 ↾ dom 𝐹))
86, 7orim12i 895 . . . . 5 ((dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹) → ((𝐻 ↾ dom 𝐹) ⊆ (𝐻 ↾ dom 𝐺) ∨ (𝐻 ↾ dom 𝐺) ⊆ (𝐻 ↾ dom 𝐹)))
9 sseq12 3847 . . . . . 6 (((𝐻 ↾ dom 𝐹) = 𝐹 ∧ (𝐻 ↾ dom 𝐺) = 𝐺) → ((𝐻 ↾ dom 𝐹) ⊆ (𝐻 ↾ dom 𝐺) ↔ 𝐹𝐺))
10 sseq12 3847 . . . . . . 7 (((𝐻 ↾ dom 𝐺) = 𝐺 ∧ (𝐻 ↾ dom 𝐹) = 𝐹) → ((𝐻 ↾ dom 𝐺) ⊆ (𝐻 ↾ dom 𝐹) ↔ 𝐺𝐹))
1110ancoms 452 . . . . . 6 (((𝐻 ↾ dom 𝐹) = 𝐹 ∧ (𝐻 ↾ dom 𝐺) = 𝐺) → ((𝐻 ↾ dom 𝐺) ⊆ (𝐻 ↾ dom 𝐹) ↔ 𝐺𝐹))
129, 11orbi12d 905 . . . . 5 (((𝐻 ↾ dom 𝐹) = 𝐹 ∧ (𝐻 ↾ dom 𝐺) = 𝐺) → (((𝐻 ↾ dom 𝐹) ⊆ (𝐻 ↾ dom 𝐺) ∨ (𝐻 ↾ dom 𝐺) ⊆ (𝐻 ↾ dom 𝐹)) ↔ (𝐹𝐺𝐺𝐹)))
138, 12syl5ib 236 . . . 4 (((𝐻 ↾ dom 𝐹) = 𝐹 ∧ (𝐻 ↾ dom 𝐺) = 𝐺) → ((dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹) → (𝐹𝐺𝐺𝐹)))
145, 13syl6 35 . . 3 (Fun 𝐻 → ((𝐹𝐻𝐺𝐻) → ((dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹) → (𝐹𝐺𝐺𝐹))))
15143imp 1098 . 2 ((Fun 𝐻 ∧ (𝐹𝐻𝐺𝐻) ∧ (dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹)) → (𝐹𝐺𝐺𝐹))
16 sspsstri 3931 . 2 ((𝐹𝐺𝐺𝐹) ↔ (𝐹𝐺𝐹 = 𝐺𝐺𝐹))
1715, 16sylib 210 1 ((Fun 𝐻 ∧ (𝐹𝐻𝐺𝐻) ∧ (dom 𝐹 ⊆ dom 𝐺 ∨ dom 𝐺 ⊆ dom 𝐹)) → (𝐹𝐺𝐹 = 𝐺𝐺𝐹))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198  wa 386  wo 836  w3o 1070  w3a 1071   = wceq 1601  wss 3792  wpss 3793  dom cdm 5355  cres 5357  Fun wfun 6129
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1839  ax-4 1853  ax-5 1953  ax-6 2021  ax-7 2055  ax-9 2116  ax-10 2135  ax-11 2150  ax-12 2163  ax-13 2334  ax-ext 2754  ax-sep 5017  ax-nul 5025  ax-pr 5138
This theorem depends on definitions:  df-bi 199  df-an 387  df-or 837  df-3or 1072  df-3an 1073  df-tru 1605  df-ex 1824  df-nf 1828  df-sb 2012  df-mo 2551  df-eu 2587  df-clab 2764  df-cleq 2770  df-clel 2774  df-nfc 2921  df-ne 2970  df-ral 3095  df-rex 3096  df-rab 3099  df-v 3400  df-dif 3795  df-un 3797  df-in 3799  df-ss 3806  df-pss 3808  df-nul 4142  df-if 4308  df-sn 4399  df-pr 4401  df-op 4405  df-br 4887  df-opab 4949  df-id 5261  df-xp 5361  df-rel 5362  df-cnv 5363  df-co 5364  df-dm 5365  df-res 5367  df-fun 6137
This theorem is referenced by: (None)
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