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Theorem isffth2 18125
Description: A fully faithful functor is a functor which is bijective on hom-sets. (Contributed by Mario Carneiro, 27-Jan-2017.)
Hypotheses
Ref Expression
isfth.b 𝐵 = (Base‘𝐶)
isfth.h 𝐻 = (Hom ‘𝐶)
isfth.j 𝐽 = (Hom ‘𝐷)
Assertion
Ref Expression
isffth2 (𝐹((𝐶 Full 𝐷) ∩ (𝐶 Faith 𝐷))𝐺 ↔ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
Distinct variable groups:   𝑥,𝑦,𝐵   𝑥,𝐶,𝑦   𝑥,𝐷,𝑦   𝑥,𝐹,𝑦   𝑥,𝐺,𝑦   𝑥,𝐻,𝑦   𝑥,𝐽,𝑦

Proof of Theorem isffth2
StepHypRef Expression
1 isfth.b . . . 4 𝐵 = (Base‘𝐶)
2 isfth.j . . . 4 𝐽 = (Hom ‘𝐷)
3 isfth.h . . . 4 𝐻 = (Hom ‘𝐶)
41, 2, 3isfull2 18120 . . 3 (𝐹(𝐶 Full 𝐷)𝐺 ↔ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
51, 3, 2isfth2 18124 . . 3 (𝐹(𝐶 Faith 𝐷)𝐺 ↔ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
64, 5anbi12i 640 . 2 ((𝐹(𝐶 Full 𝐷)𝐺 ∧ 𝐹(𝐶 Faith 𝐷)𝐺) ↔ ((𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ∧ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)))))
7 brin 5161 . 2 (𝐹((𝐶 Full 𝐷) ∩ (𝐶 Faith 𝐷))𝐺 ↔ (𝐹(𝐶 Full 𝐷)𝐺 ∧ 𝐹(𝐶 Faith 𝐷)𝐺))
8 df-f1o 6568 . . . . . . 7 ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ↔ ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
98biancomi 468 . . . . . 6 ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ↔ ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
1092ralbii 3141 . . . . 5 (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
11 r19.26-2 3151 . . . . 5 (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ↔ (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
1210, 11bitri 278 . . . 4 (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ↔ (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
1312anbi2i 635 . . 3 ((𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ↔ (𝐹(𝐶 Func 𝐷)𝐺 ∧ (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)))))
14 anandi 689 . . 3 ((𝐹(𝐶 Func 𝐷)𝐺 ∧ (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦)) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)))) ↔ ((𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ∧ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)))))
1513, 14bitri 278 . 2 ((𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ↔ ((𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))) ∧ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1((𝐹‘𝑥)𝐽(𝐹‘𝑦)))))
166, 7, 153bitr4i 306 1 (𝐹((𝐶 Full 𝐷) ∩ (𝐶 Faith 𝐷))𝐺 ↔ (𝐹(𝐶 Func 𝐷)𝐺 ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐺𝑦):(𝑥𝐻𝑦)⟶1-1onto((𝐹‘𝑥)𝐽(𝐹‘𝑦))))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   ∧ wa 401   = wceq 1570  ∀wral 3080   ∩ cin 4092   class class class wbr 5106  ⟶1-1wf1 6558  ⟶ontowfo 6559  ⟶1-1ontowf1o 6560  ‘cfv 6561  (class class class)co 7446  Basecbs 17419  Hom chom 17471   Func cfunc 18061   Full cful 18111   Faith cfth 18112
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5236  ax-sep 5253  ax-nul 5264  ax-pow 5332  ax-pr 5396  ax-un 7778
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5172  df-mpt 5191  df-id 5551  df-xp 5662  df-rel 5663  df-cnv 5664  df-co 5665  df-dm 5666  df-rn 5667  df-res 5668  df-ima 5669  df-iota 6515  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-ov 7449  df-oprab 7450  df-mpo 7451  df-1st 8028  df-2nd 8029  df-map 8880  df-ixp 8957  df-func 18065  df-full 18113  df-fth 18114
This theorem is used by:  idffth  18142  ressffth  18147  catciso  18318  yonffthlem  18488  swapfffth  50620  fucoppc  50760  thincciso2  50805  diagffth  50891
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