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| Mirrors > Home > MPE Home > Th. List > Mathboxes > termchom2 | Structured version Visualization version GIF version | ||
| Description: The hom-set of a terminal category is a singleton of the identity morphism. (Contributed by Zhi Wang, 21-Oct-2025.) |
| Ref | Expression |
|---|---|
| termchom.c | ⊢ (𝜑 → 𝐶 ∈ TermCat) |
| termchom.b | ⊢ 𝐵 = (Base‘𝐶) |
| termchom.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
| termchom.y | ⊢ (𝜑 → 𝑌 ∈ 𝐵) |
| termchom.h | ⊢ 𝐻 = (Hom ‘𝐶) |
| termchom.i | ⊢ 1 = (Id‘𝐶) |
| termchom2.z | ⊢ (𝜑 → 𝑍 ∈ 𝐵) |
| Ref | Expression |
|---|---|
| termchom2 | ⊢ (𝜑 → (𝑋𝐻𝑌) = {( 1 ‘𝑍)}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | termchom.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ TermCat) | |
| 2 | termchom.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
| 3 | termchom.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
| 4 | termchom.y | . . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵) | |
| 5 | termchom.h | . . 3 ⊢ 𝐻 = (Hom ‘𝐶) | |
| 6 | termchom.i | . . 3 ⊢ 1 = (Id‘𝐶) | |
| 7 | 1, 2, 3, 4, 5, 6 | termchom 49499 | . 2 ⊢ (𝜑 → (𝑋𝐻𝑌) = {( 1 ‘𝑋)}) |
| 8 | termchom2.z | . . . . 5 ⊢ (𝜑 → 𝑍 ∈ 𝐵) | |
| 9 | 1, 2, 3, 8 | termcbasmo 49494 | . . . 4 ⊢ (𝜑 → 𝑋 = 𝑍) |
| 10 | 9 | fveq2d 6821 | . . 3 ⊢ (𝜑 → ( 1 ‘𝑋) = ( 1 ‘𝑍)) |
| 11 | 10 | sneqd 4586 | . 2 ⊢ (𝜑 → {( 1 ‘𝑋)} = {( 1 ‘𝑍)}) |
| 12 | 7, 11 | eqtrd 2765 | 1 ⊢ (𝜑 → (𝑋𝐻𝑌) = {( 1 ‘𝑍)}) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2110 {csn 4574 ‘cfv 6477 (class class class)co 7341 Basecbs 17112 Hom chom 17164 Idccid 17563 TermCatctermc 49483 |
| 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 1968 ax-7 2009 ax-8 2112 ax-9 2120 ax-10 2143 ax-11 2159 ax-12 2179 ax-ext 2702 ax-rep 5215 ax-sep 5232 ax-nul 5242 ax-pr 5368 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rmo 3344 df-reu 3345 df-rab 3394 df-v 3436 df-sbc 3740 df-csb 3849 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-nul 4282 df-if 4474 df-sn 4575 df-pr 4577 df-op 4581 df-uni 4858 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6433 df-fun 6479 df-fn 6480 df-f 6481 df-f1 6482 df-fo 6483 df-f1o 6484 df-fv 6485 df-riota 7298 df-ov 7344 df-cat 17566 df-cid 17567 df-thinc 49429 df-termc 49484 |
| This theorem is referenced by: diag1f1olem 49544 |
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