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| Mirrors > Home > MPE Home > Th. List > Mathboxes > isinito4 | Structured version Visualization version GIF version | ||
| Description: The predicate "is an initial object" of a category, using universal property. (Contributed by Zhi Wang, 17-Nov-2025.) |
| Ref | Expression |
|---|---|
| isinito4.1 | ⊢ (𝜑 → 1 ∈ TermCat) |
| isinito4.x | ⊢ (𝜑 → 𝑋 ∈ (Base‘ 1 )) |
| isinito4.f | ⊢ (𝜑 → 𝐹 ∈ (𝐶 Func 1 )) |
| Ref | Expression |
|---|---|
| isinito4 | ⊢ (𝜑 → (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ dom (𝐹(𝐶 UP 1 )𝑋))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2731 | . . 3 ⊢ (SetCat‘1o) = (SetCat‘1o) | |
| 2 | eqid 2731 | . . 3 ⊢ ((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅) = ((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅) | |
| 3 | 1, 2 | isinito3 49531 | . 2 ⊢ (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ dom (((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅)(𝐶 UP (SetCat‘1o))∅)) |
| 4 | 1 | setc1obas 49523 | . . . 4 ⊢ 1o = (Base‘(SetCat‘1o)) |
| 5 | eqid 2731 | . . . 4 ⊢ (Base‘ 1 ) = (Base‘ 1 ) | |
| 6 | 0lt1o 8419 | . . . . 5 ⊢ ∅ ∈ 1o | |
| 7 | 6 | a1i 11 | . . . 4 ⊢ (𝜑 → ∅ ∈ 1o) |
| 8 | isinito4.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ (Base‘ 1 )) | |
| 9 | isinito4.f | . . . . . . 7 ⊢ (𝜑 → 𝐹 ∈ (𝐶 Func 1 )) | |
| 10 | 9 | func1st2nd 49107 | . . . . . 6 ⊢ (𝜑 → (1st ‘𝐹)(𝐶 Func 1 )(2nd ‘𝐹)) |
| 11 | 10 | funcrcl2 49110 | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ Cat) |
| 12 | 1, 2, 11 | funcsetc1ocl 49527 | . . . 4 ⊢ (𝜑 → ((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅) ∈ (𝐶 Func (SetCat‘1o))) |
| 13 | setc1oterm 49522 | . . . . 5 ⊢ (SetCat‘1o) ∈ TermCat | |
| 14 | 13 | a1i 11 | . . . 4 ⊢ (𝜑 → (SetCat‘1o) ∈ TermCat) |
| 15 | isinito4.1 | . . . 4 ⊢ (𝜑 → 1 ∈ TermCat) | |
| 16 | 4, 5, 7, 8, 12, 9, 14, 15 | uobeqterm 49577 | . . 3 ⊢ (𝜑 → dom (((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅)(𝐶 UP (SetCat‘1o))∅) = dom (𝐹(𝐶 UP 1 )𝑋)) |
| 17 | 16 | eleq2d 2817 | . 2 ⊢ (𝜑 → (𝐼 ∈ dom (((1st ‘((SetCat‘1o)Δfunc𝐶))‘∅)(𝐶 UP (SetCat‘1o))∅) ↔ 𝐼 ∈ dom (𝐹(𝐶 UP 1 )𝑋))) |
| 18 | 3, 17 | bitrid 283 | 1 ⊢ (𝜑 → (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ dom (𝐹(𝐶 UP 1 )𝑋))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∈ wcel 2111 ∅c0 4283 dom cdm 5616 ‘cfv 6481 (class class class)co 7346 1st c1st 7919 2nd c2nd 7920 1oc1o 8378 Basecbs 17117 Func cfunc 17758 InitOcinito 17885 SetCatcsetc 17979 Δfunccdiag 18115 UP cup 49204 TermCatctermc 49503 |
| 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 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5217 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11059 ax-resscn 11060 ax-1cn 11061 ax-icn 11062 ax-addcl 11063 ax-addrcl 11064 ax-mulcl 11065 ax-mulrcl 11066 ax-mulcom 11067 ax-addass 11068 ax-mulass 11069 ax-distr 11070 ax-i2m1 11071 ax-1ne0 11072 ax-1rid 11073 ax-rnegex 11074 ax-rrecex 11075 ax-cnre 11076 ax-pre-lttri 11077 ax-pre-lttrn 11078 ax-pre-ltadd 11079 ax-pre-mulgt0 11080 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-tp 4581 df-op 4583 df-ot 4585 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-1st 7921 df-2nd 7922 df-supp 8091 df-tpos 8156 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-er 8622 df-map 8752 df-ixp 8822 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-pnf 11145 df-mnf 11146 df-xr 11147 df-ltxr 11148 df-le 11149 df-sub 11343 df-neg 11344 df-nn 12123 df-2 12185 df-3 12186 df-4 12187 df-5 12188 df-6 12189 df-7 12190 df-8 12191 df-9 12192 df-n0 12379 df-z 12466 df-dec 12586 df-uz 12730 df-fz 13405 df-struct 17055 df-sets 17072 df-slot 17090 df-ndx 17102 df-base 17118 df-hom 17182 df-cco 17183 df-cat 17571 df-cid 17572 df-homf 17573 df-comf 17574 df-oppc 17615 df-sect 17651 df-inv 17652 df-iso 17653 df-cic 17700 df-func 17762 df-idfu 17763 df-cofu 17764 df-full 17810 df-fth 17811 df-nat 17850 df-fuc 17851 df-inito 17888 df-termo 17889 df-setc 17980 df-catc 18003 df-xpc 18075 df-1stf 18076 df-curf 18117 df-diag 18119 df-up 49205 df-thinc 49449 df-termc 49504 |
| This theorem is referenced by: isinito4a 49579 initocmd 49700 |
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