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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 2737 | . . 3 ⊢ ( 1 Δfunc𝐶) = ( 1 Δfunc𝐶) | |
| 2 | funcsetc1o.1 | . . . . . 6 ⊢ 1 = (SetCat‘1o) | |
| 3 | setc1oterm 49850 | . . . . . 6 ⊢ (SetCat‘1o) ∈ TermCat | |
| 4 | 2, 3 | eqeltri 2833 | . . . . 5 ⊢ 1 ∈ TermCat |
| 5 | 4 | a1i 11 | . . . 4 ⊢ (𝜑 → 1 ∈ TermCat) |
| 6 | 5 | termccd 49838 | . . 3 ⊢ (𝜑 → 1 ∈ Cat) |
| 7 | funcsetc1o.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
| 8 | 2 | setc1obas 49851 | . . 3 ⊢ 1o = (Base‘ 1 ) |
| 9 | 0lt1o 8441 | . . . 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 2737 | . . 3 ⊢ (Id‘ 1 ) = (Id‘ 1 ) | |
| 15 | 1, 6, 7, 8, 10, 11, 12, 13, 14 | diag1a 49664 | . 2 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉) |
| 16 | df1o2 8414 | . . . 4 ⊢ 1o = {∅} | |
| 17 | 16 | xpeq2i 5659 | . . 3 ⊢ (𝐵 × 1o) = (𝐵 × {∅}) |
| 18 | 2, 14 | setc1oid 49854 | . . . . . . . 8 ⊢ ((Id‘ 1 )‘∅) = ∅ |
| 19 | 18 | sneqi 4593 | . . . . . . 7 ⊢ {((Id‘ 1 )‘∅)} = {∅} |
| 20 | 16, 19 | eqtr4i 2763 | . . . . . 6 ⊢ 1o = {((Id‘ 1 )‘∅)} |
| 21 | 20 | xpeq2i 5659 | . . . . 5 ⊢ ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}) |
| 22 | 21 | a1i 11 | . . . 4 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → ((𝑥𝐻𝑦) × 1o) = ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 23 | 22 | mpoeq3ia 7446 | . . 3 ⊢ (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o)) = (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)})) |
| 24 | 17, 23 | opeq12i 4836 | . 2 ⊢ 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉 = 〈(𝐵 × {∅}), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × {((Id‘ 1 )‘∅)}))〉 |
| 25 | 15, 24 | eqtr4di 2790 | 1 ⊢ (𝜑 → 𝐹 = 〈(𝐵 × 1o), (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ ((𝑥𝐻𝑦) × 1o))〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∅c0 4287 {csn 4582 〈cop 4588 × cxp 5630 ‘cfv 6500 (class class class)co 7368 ∈ cmpo 7370 1st c1st 7941 1oc1o 8400 Basecbs 17148 Hom chom 17200 Catccat 17599 Idccid 17600 SetCatcsetc 18011 Δfunccdiag 18147 TermCatctermc 49831 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-map 8777 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 df-n0 12414 df-z 12501 df-dec 12620 df-uz 12764 df-fz 13436 df-struct 17086 df-slot 17121 df-ndx 17133 df-base 17149 df-hom 17213 df-cco 17214 df-cat 17603 df-cid 17604 df-func 17794 df-nat 17882 df-fuc 17883 df-setc 18012 df-xpc 18107 df-1stf 18108 df-curf 18149 df-diag 18151 df-thinc 49777 df-termc 49832 |
| This theorem is referenced by: (None) |
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