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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 2729 | . . 3 ⊢ ( 1 Δfunc𝐶) = ( 1 Δfunc𝐶) | |
| 2 | funcsetc1o.1 | . . . . . 6 ⊢ 1 = (SetCat‘1o) | |
| 3 | setc1oterm 49496 | . . . . . 6 ⊢ (SetCat‘1o) ∈ TermCat | |
| 4 | 2, 3 | eqeltri 2824 | . . . . 5 ⊢ 1 ∈ TermCat |
| 5 | 4 | a1i 11 | . . . 4 ⊢ (𝜑 → 1 ∈ TermCat) |
| 6 | 5 | termccd 49484 | . . 3 ⊢ (𝜑 → 1 ∈ Cat) |
| 7 | funcsetc1o.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
| 8 | 2 | setc1obas 49497 | . . 3 ⊢ 1o = (Base‘ 1 ) |
| 9 | 0lt1o 8429 | . . . 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 2729 | . . 3 ⊢ (Id‘ 1 ) = (Id‘ 1 ) | |
| 15 | 1, 6, 7, 8, 10, 11, 12, 13, 14 | diag1a 49310 | . 2 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉) |
| 16 | df1o2 8402 | . . . 4 ⊢ 1o = {∅} | |
| 17 | 16 | xpeq2i 5650 | . . 3 ⊢ (𝐵 × 1o) = (𝐵 × {∅}) |
| 18 | 2, 14 | setc1oid 49500 | . . . . . . . 8 ⊢ ((Id‘ 1 )‘∅) = ∅ |
| 19 | 18 | sneqi 4590 | . . . . . . 7 ⊢ {((Id‘ 1 )‘∅)} = {∅} |
| 20 | 16, 19 | eqtr4i 2755 | . . . . . 6 ⊢ 1o = {((Id‘ 1 )‘∅)} |
| 21 | 20 | xpeq2i 5650 | . . . . 5 ⊢ ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}) |
| 22 | 21 | a1i 11 | . . . 4 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 23 | 22 | mpoeq3ia 7431 | . . 3 ⊢ (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o)) = (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 24 | 17, 23 | opeq12i 4832 | . 2 ⊢ 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉 |
| 25 | 15, 24 | eqtr4di 2782 | 1 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∅c0 4286 {csn 4579 〈cop 4585 × cxp 5621 ‘cfv 6486 (class class class)co 7353 ∈ cmpo 7355 1st c1st 7929 1oc1o 8388 Basecbs 17139 Hom chom 17191 Catccat 17589 Idccid 17590 SetCatcsetc 18001 Δfunccdiag 18137 TermCatctermc 49477 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 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 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-tp 4584 df-op 4586 df-uni 4862 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-1o 8395 df-er 8632 df-map 8762 df-ixp 8832 df-en 8880 df-dom 8881 df-sdom 8882 df-fin 8883 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-nn 12148 df-2 12210 df-3 12211 df-4 12212 df-5 12213 df-6 12214 df-7 12215 df-8 12216 df-9 12217 df-n0 12404 df-z 12491 df-dec 12611 df-uz 12755 df-fz 13430 df-struct 17077 df-slot 17112 df-ndx 17124 df-base 17140 df-hom 17204 df-cco 17205 df-cat 17593 df-cid 17594 df-func 17784 df-nat 17872 df-fuc 17873 df-setc 18002 df-xpc 18097 df-1stf 18098 df-curf 18139 df-diag 18141 df-thinc 49423 df-termc 49478 |
| This theorem is referenced by: (None) |
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