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Theorem thincmoALT 45834
Description: Alternate proof for thincmo 45833. (Contributed by Zhi Wang, 21-Sep-2024.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
thincmo.c (𝜑𝐶 ∈ ThinCat)
thincmo.x (𝜑𝑋𝐵)
thincmo.y (𝜑𝑌𝐵)
thincmo.b 𝐵 = (Base‘𝐶)
thincmo.h 𝐻 = (Hom ‘𝐶)
Assertion
Ref Expression
thincmoALT (𝜑 → ∃*𝑓 𝑓 ∈ (𝑋𝐻𝑌))
Distinct variable groups:   𝐵,𝑓   𝐶,𝑓   𝑓,𝐻   𝑓,𝑋   𝑓,𝑌   𝜑,𝑓

Proof of Theorem thincmoALT
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 thincmo.c . . 3 (𝜑𝐶 ∈ ThinCat)
2 thincmo.b . . . . 5 𝐵 = (Base‘𝐶)
3 thincmo.h . . . . 5 𝐻 = (Hom ‘𝐶)
42, 3isthinc 45828 . . . 4 (𝐶 ∈ ThinCat ↔ (𝐶 ∈ Cat ∧ ∀𝑥𝐵𝑦𝐵 ∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦)))
54simprbi 500 . . 3 (𝐶 ∈ ThinCat → ∀𝑥𝐵𝑦𝐵 ∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦))
61, 5syl 17 . 2 (𝜑 → ∀𝑥𝐵𝑦𝐵 ∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦))
7 thincmo.x . . 3 (𝜑𝑋𝐵)
8 thincmo.y . . 3 (𝜑𝑌𝐵)
9 oveq12 7191 . . . . . 6 ((𝑥 = 𝑋𝑦 = 𝑌) → (𝑥𝐻𝑦) = (𝑋𝐻𝑌))
109eleq2d 2819 . . . . 5 ((𝑥 = 𝑋𝑦 = 𝑌) → (𝑓 ∈ (𝑥𝐻𝑦) ↔ 𝑓 ∈ (𝑋𝐻𝑌)))
1110mobidv 2550 . . . 4 ((𝑥 = 𝑋𝑦 = 𝑌) → (∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦) ↔ ∃*𝑓 𝑓 ∈ (𝑋𝐻𝑌)))
1211rspc2gv 3538 . . 3 ((𝑋𝐵𝑌𝐵) → (∀𝑥𝐵𝑦𝐵 ∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦) → ∃*𝑓 𝑓 ∈ (𝑋𝐻𝑌)))
137, 8, 12syl2anc 587 . 2 (𝜑 → (∀𝑥𝐵𝑦𝐵 ∃*𝑓 𝑓 ∈ (𝑥𝐻𝑦) → ∃*𝑓 𝑓 ∈ (𝑋𝐻𝑌)))
146, 13mpd 15 1 (𝜑 → ∃*𝑓 𝑓 ∈ (𝑋𝐻𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1542  wcel 2114  ∃*wmo 2539  wral 3054  cfv 6349  (class class class)co 7182  Basecbs 16598  Hom chom 16691  Catccat 17050  ThinCatcthinc 45826
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2711  ax-nul 5184
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2541  df-eu 2571  df-clab 2718  df-cleq 2731  df-clel 2812  df-ral 3059  df-rex 3060  df-rab 3063  df-v 3402  df-sbc 3686  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4222  df-sn 4527  df-pr 4529  df-op 4533  df-uni 4807  df-br 5041  df-iota 6307  df-fv 6357  df-ov 7185  df-thinc 45827
This theorem is referenced by: (None)
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