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Mirrors > Home > MPE Home > Th. List > hof1 | Structured version Visualization version GIF version |
Description: The object part of the Hom functor maps 𝑋, 𝑌 to the set of morphisms from 𝑋 to 𝑌. (Contributed by Mario Carneiro, 15-Jan-2017.) |
Ref | Expression |
---|---|
hofval.m | ⊢ 𝑀 = (HomF‘𝐶) |
hofval.c | ⊢ (𝜑 → 𝐶 ∈ Cat) |
hof1.b | ⊢ 𝐵 = (Base‘𝐶) |
hof1.h | ⊢ 𝐻 = (Hom ‘𝐶) |
hof1.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
hof1.y | ⊢ (𝜑 → 𝑌 ∈ 𝐵) |
Ref | Expression |
---|---|
hof1 | ⊢ (𝜑 → (𝑋(1st ‘𝑀)𝑌) = (𝑋𝐻𝑌)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hofval.m | . . . 4 ⊢ 𝑀 = (HomF‘𝐶) | |
2 | hofval.c | . . . 4 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
3 | 1, 2 | hof1fval 17503 | . . 3 ⊢ (𝜑 → (1st ‘𝑀) = (Homf ‘𝐶)) |
4 | 3 | oveqd 7173 | . 2 ⊢ (𝜑 → (𝑋(1st ‘𝑀)𝑌) = (𝑋(Homf ‘𝐶)𝑌)) |
5 | eqid 2821 | . . 3 ⊢ (Homf ‘𝐶) = (Homf ‘𝐶) | |
6 | hof1.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
7 | hof1.h | . . 3 ⊢ 𝐻 = (Hom ‘𝐶) | |
8 | hof1.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
9 | hof1.y | . . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵) | |
10 | 5, 6, 7, 8, 9 | homfval 16962 | . 2 ⊢ (𝜑 → (𝑋(Homf ‘𝐶)𝑌) = (𝑋𝐻𝑌)) |
11 | 4, 10 | eqtrd 2856 | 1 ⊢ (𝜑 → (𝑋(1st ‘𝑀)𝑌) = (𝑋𝐻𝑌)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ‘cfv 6355 (class class class)co 7156 1st c1st 7687 Basecbs 16483 Hom chom 16576 Catccat 16935 Homf chomf 16937 HomFchof 17498 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-ov 7159 df-oprab 7160 df-mpo 7161 df-1st 7689 df-2nd 7690 df-homf 16941 df-hof 17500 |
This theorem is referenced by: yon11 17514 yonedalem21 17523 |
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