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| Mirrors > Home > MPE Home > Th. List > Mathboxes > funcsetc1o | Structured version Visualization version GIF version | ||
| Description: Value of the functor to the trivial category. The converse is also true because 𝐹 would be the empty set if 𝐶 were not a category; and the empty set cannot equal an ordered pair of two sets. (Contributed by Zhi Wang, 22-Oct-2025.) |
| Ref | Expression |
|---|---|
| funcsetc1o.1 | ⊢ 1 = (SetCat‘1o) |
| funcsetc1o.f | ⊢ 𝐹 = ((1st ‘( 1 Δfunc𝐶))‘∅) |
| funcsetc1o.c | ⊢ (𝜑 → 𝐶 ∈ Cat) |
| funcsetc1o.b | ⊢ 𝐵 = (Base‘𝐶) |
| funcsetc1o.h | ⊢ 𝐻 = (Hom ‘𝐶) |
| Ref | Expression |
|---|---|
| funcsetc1o | ⊢ (𝜑 → 𝐹 = 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . . 3 ⊢ ( 1 Δfunc𝐶) = ( 1 Δfunc𝐶) | |
| 2 | funcsetc1o.1 | . . . . . 6 ⊢ 1 = (SetCat‘1o) | |
| 3 | setc1oterm 50269 | . . . . . 6 ⊢ (SetCat‘1o) ∈ TermCat | |
| 4 | 2, 3 | eqeltri 2859 | . . . . 5 ⊢ 1 ∈ TermCat |
| 5 | 4 | a1i 11 | . . . 4 ⊢ (𝜑 → 1 ∈ TermCat) |
| 6 | 5 | termccd 50257 | . . 3 ⊢ (𝜑 → 1 ∈ Cat) |
| 7 | funcsetc1o.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
| 8 | 2 | setc1obas 50270 | . . 3 ⊢ 1o = (Base‘ 1 ) |
| 9 | 0lt1o 8485 | . . . 4 ⊢ ∅ ∈ 1o | |
| 10 | 9 | a1i 11 | . . 3 ⊢ (𝜑 → ∅ ∈ 1o) |
| 11 | funcsetc1o.f | . . 3 ⊢ 𝐹 = ((1st ‘( 1 Δfunc𝐶))‘∅) | |
| 12 | funcsetc1o.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
| 13 | funcsetc1o.h | . . 3 ⊢ 𝐻 = (Hom ‘𝐶) | |
| 14 | eqid 2763 | . . 3 ⊢ (Id‘ 1 ) = (Id‘ 1 ) | |
| 15 | 1, 6, 7, 8, 10, 11, 12, 13, 14 | diag1a 50083 | . 2 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉) |
| 16 | df1o2 8456 | . . . 4 ⊢ 1o = {∅} | |
| 17 | 16 | xpeq2i 5688 | . . 3 ⊢ (𝐵 × 1o) = (𝐵 × {∅}) |
| 18 | 2, 14 | setc1oid 50273 | . . . . . . . 8 ⊢ ((Id‘ 1 )‘∅) = ∅ |
| 19 | 18 | sneqi 4600 | . . . . . . 7 ⊢ {((Id‘ 1 )‘∅)} = {∅} |
| 20 | 16, 19 | eqtr4i 2789 | . . . . . 6 ⊢ 1o = {((Id‘ 1 )‘∅)} |
| 21 | 20 | xpeq2i 5688 | . . . . 5 ⊢ ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}) |
| 22 | 21 | a1i 11 | . . . 4 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 23 | 22 | mpoeq3ia 7488 | . . 3 ⊢ (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o)) = (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 24 | 17, 23 | opeq12i 4843 | . 2 ⊢ 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉 |
| 25 | 15, 24 | eqtr4di 2816 | 1 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1570 ∈ wcel 2143 ∅c0 4286 {csn 4589 〈cop 4595 × cxp 5659 ‘cfv 6536 (class class class)co 7410 ∈ cmpo 7412 1st c1st 7980 1oc1o 8442 Basecbs 17264 Hom chom 17316 Catccat 17715 Idccid 17716 SetCatcsetc 18127 Δfunccdiag 18263 TermCatctermc 50250 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5238 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-cnex 11151 ax-resscn 11152 ax-1cn 11153 ax-icn 11154 ax-addcl 11155 ax-addrcl 11156 ax-mulcl 11157 ax-mulrcl 11158 ax-mulcom 11159 ax-addass 11160 ax-mulass 11161 ax-distr 11162 ax-i2m1 11163 ax-1ne0 11164 ax-1rid 11165 ax-rnegex 11166 ax-rrecex 11167 ax-cnre 11168 ax-pre-lttri 11169 ax-pre-lttrn 11170 ax-pre-ltadd 11171 ax-pre-mulgt0 11172 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-tp 4594 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-er 8690 df-map 8822 df-ixp 8892 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-pnf 11240 df-mnf 11241 df-xr 11242 df-ltxr 11243 df-le 11244 df-sub 11438 df-neg 11439 df-nn 12229 df-2 12298 df-3 12299 df-4 12300 df-5 12301 df-6 12302 df-7 12303 df-8 12304 df-9 12305 df-n0 12500 df-z 12587 df-dec 12707 df-uz 12858 df-fz 13531 df-struct 17202 df-slot 17237 df-ndx 17249 df-base 17265 df-hom 17329 df-cco 17330 df-cat 17719 df-cid 17720 df-func 17910 df-nat 17998 df-fuc 17999 df-setc 18128 df-xpc 18223 df-1stf 18224 df-curf 18265 df-diag 18267 df-thinc 50196 df-termc 50251 |
| This theorem is referenced by: (None) |
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