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Mirrors > Home > MPE Home > Th. List > 0ssc | Structured version Visualization version GIF version |
Description: For any category 𝐶, the empty set is a subcategory subset of 𝐶. (Contributed by AV, 23-Apr-2020.) |
Ref | Expression |
---|---|
0ssc | ⊢ (𝐶 ∈ Cat → ∅ ⊆cat (Homf ‘𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ss 3924 | . . 3 ⊢ ∅ ⊆ (Base‘𝐶) | |
2 | 1 | a1i 11 | . 2 ⊢ (𝐶 ∈ Cat → ∅ ⊆ (Base‘𝐶)) |
3 | ral0 4028 | . . 3 ⊢ ∀𝑥 ∈ ∅ ∀𝑦 ∈ ∅ (𝑥∅𝑦) ⊆ (𝑥(Homf ‘𝐶)𝑦) | |
4 | 3 | a1i 11 | . 2 ⊢ (𝐶 ∈ Cat → ∀𝑥 ∈ ∅ ∀𝑦 ∈ ∅ (𝑥∅𝑦) ⊆ (𝑥(Homf ‘𝐶)𝑦)) |
5 | f0 5999 | . . . . . 6 ⊢ ∅:∅⟶∅ | |
6 | ffn 5958 | . . . . . 6 ⊢ (∅:∅⟶∅ → ∅ Fn ∅) | |
7 | 5, 6 | ax-mp 5 | . . . . 5 ⊢ ∅ Fn ∅ |
8 | xp0 5471 | . . . . . 6 ⊢ (∅ × ∅) = ∅ | |
9 | 8 | fneq2i 5900 | . . . . 5 ⊢ (∅ Fn (∅ × ∅) ↔ ∅ Fn ∅) |
10 | 7, 9 | mpbir 220 | . . . 4 ⊢ ∅ Fn (∅ × ∅) |
11 | 10 | a1i 11 | . . 3 ⊢ (𝐶 ∈ Cat → ∅ Fn (∅ × ∅)) |
12 | eqid 2610 | . . . . 5 ⊢ (Homf ‘𝐶) = (Homf ‘𝐶) | |
13 | eqid 2610 | . . . . 5 ⊢ (Base‘𝐶) = (Base‘𝐶) | |
14 | 12, 13 | homffn 16176 | . . . 4 ⊢ (Homf ‘𝐶) Fn ((Base‘𝐶) × (Base‘𝐶)) |
15 | 14 | a1i 11 | . . 3 ⊢ (𝐶 ∈ Cat → (Homf ‘𝐶) Fn ((Base‘𝐶) × (Base‘𝐶))) |
16 | fvex 6113 | . . . 4 ⊢ (Base‘𝐶) ∈ V | |
17 | 16 | a1i 11 | . . 3 ⊢ (𝐶 ∈ Cat → (Base‘𝐶) ∈ V) |
18 | 11, 15, 17 | isssc 16303 | . 2 ⊢ (𝐶 ∈ Cat → (∅ ⊆cat (Homf ‘𝐶) ↔ (∅ ⊆ (Base‘𝐶) ∧ ∀𝑥 ∈ ∅ ∀𝑦 ∈ ∅ (𝑥∅𝑦) ⊆ (𝑥(Homf ‘𝐶)𝑦)))) |
19 | 2, 4, 18 | mpbir2and 959 | 1 ⊢ (𝐶 ∈ Cat → ∅ ⊆cat (Homf ‘𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1977 ∀wral 2896 Vcvv 3173 ⊆ wss 3540 ∅c0 3874 class class class wbr 4583 × cxp 5036 Fn wfn 5799 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 Basecbs 15695 Catccat 16148 Homf chomf 16150 ⊆cat cssc 16290 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-1st 7059 df-2nd 7060 df-ixp 7795 df-homf 16154 df-ssc 16293 |
This theorem is referenced by: 0subcat 16321 |
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