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Theorem thincsect2 50806
Description: In a thin category, 𝐹 is a section of 𝐺 iff 𝐺 is a section of 𝐹. Example 7.25(4) of [Adamek] p. 108. (Contributed by Zhi Wang, 24-Sep-2024.)
Hypotheses
Ref Expression
thincsect.c (𝜑 → 𝐶 ∈ ThinCat)
thincsect.b 𝐵 = (Base‘𝐶)
thincsect.x (𝜑 → 𝑋 ∈ 𝐵)
thincsect.y (𝜑 → 𝑌 ∈ 𝐵)
thincsect.s 𝑆 = (Sect‘𝐶)
Assertion
Ref Expression
thincsect2 (𝜑 → (𝐹(𝑋𝑆𝑌)𝐺 ↔ 𝐺(𝑌𝑆𝑋)𝐹))

Proof of Theorem thincsect2
StepHypRef Expression
1 ancom 466 . . 3 ((𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌) ∧ 𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋)) ↔ (𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋) ∧ 𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌)))
21a1i 11 . 2 (𝜑 → ((𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌) ∧ 𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋)) ↔ (𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋) ∧ 𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌))))
3 thincsect.c . . 3 (𝜑 → 𝐶 ∈ ThinCat)
4 thincsect.b . . 3 𝐵 = (Base‘𝐶)
5 thincsect.x . . 3 (𝜑 → 𝑋 ∈ 𝐵)
6 thincsect.y . . 3 (𝜑 → 𝑌 ∈ 𝐵)
7 thincsect.s . . 3 𝑆 = (Sect‘𝐶)
8 eqid 2763 . . 3 (Hom ‘𝐶) = (Hom ‘𝐶)
93, 4, 5, 6, 7, 8thincsect 50805 . 2 (𝜑 → (𝐹(𝑋𝑆𝑌)𝐺 ↔ (𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌) ∧ 𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋))))
103, 4, 6, 5, 7, 8thincsect 50805 . 2 (𝜑 → (𝐺(𝑌𝑆𝑋)𝐹 ↔ (𝐺 ∈ (𝑌(Hom ‘𝐶)𝑋) ∧ 𝐹 ∈ (𝑋(Hom ‘𝐶)𝑌))))
112, 9, 103bitr4d 314 1 (𝜑 → (𝐹(𝑋𝑆𝑌)𝐺 ↔ 𝐺(𝑌𝑆𝑋)𝐹))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570   ∈ wcel 2147   class class class wbr 5106  ‘cfv 6555  (class class class)co 7440  Basecbs 17413  Hom chom 17465  Sectcsect 17945  ThinCatcthinc 50755
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 5235  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7772
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-rmo 3369  df-reu 3370  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 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6509  df-fun 6557  df-fn 6558  df-f 6559  df-f1 6560  df-fo 6561  df-f1o 6562  df-fv 6563  df-riota 7397  df-ov 7443  df-oprab 7444  df-mpo 7445  df-1st 8022  df-2nd 8023  df-cat 17868  df-cid 17869  df-sect 17948  df-thinc 50756
This theorem is used by:  thincinv  50807
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