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Mirrors > Home > MPE Home > Th. List > dftermo2 | Structured version Visualization version GIF version |
Description: A terminal object is an initial object in the opposite category. An alternate definition of df-termo 17316 depending on df-inito 17315. (Contributed by Zhi Wang, 29-Aug-2024.) |
Ref | Expression |
---|---|
dftermo2 | ⊢ TermO = (𝑐 ∈ Cat ↦ (InitO‘(oppCat‘𝑐))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-termo 17316 | . 2 ⊢ TermO = (𝑐 ∈ Cat ↦ {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)}) | |
2 | eqid 2758 | . . . . . 6 ⊢ (oppCat‘𝑐) = (oppCat‘𝑐) | |
3 | 2 | oppccat 17055 | . . . . 5 ⊢ (𝑐 ∈ Cat → (oppCat‘𝑐) ∈ Cat) |
4 | eqid 2758 | . . . . . 6 ⊢ (Base‘𝑐) = (Base‘𝑐) | |
5 | 2, 4 | oppcbas 17051 | . . . . 5 ⊢ (Base‘𝑐) = (Base‘(oppCat‘𝑐)) |
6 | eqid 2758 | . . . . 5 ⊢ (Hom ‘(oppCat‘𝑐)) = (Hom ‘(oppCat‘𝑐)) | |
7 | 3, 5, 6 | initoval 17324 | . . . 4 ⊢ (𝑐 ∈ Cat → (InitO‘(oppCat‘𝑐)) = {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑎(Hom ‘(oppCat‘𝑐))𝑏)}) |
8 | eqid 2758 | . . . . . . . . 9 ⊢ (Hom ‘𝑐) = (Hom ‘𝑐) | |
9 | 8, 2 | oppchom 17048 | . . . . . . . 8 ⊢ (𝑎(Hom ‘(oppCat‘𝑐))𝑏) = (𝑏(Hom ‘𝑐)𝑎) |
10 | 9 | eleq2i 2843 | . . . . . . 7 ⊢ (ℎ ∈ (𝑎(Hom ‘(oppCat‘𝑐))𝑏) ↔ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)) |
11 | 10 | eubii 2604 | . . . . . 6 ⊢ (∃!ℎ ℎ ∈ (𝑎(Hom ‘(oppCat‘𝑐))𝑏) ↔ ∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)) |
12 | 11 | ralbii 3097 | . . . . 5 ⊢ (∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑎(Hom ‘(oppCat‘𝑐))𝑏) ↔ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)) |
13 | 12 | rabbii 3385 | . . . 4 ⊢ {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑎(Hom ‘(oppCat‘𝑐))𝑏)} = {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)} |
14 | 7, 13 | eqtrdi 2809 | . . 3 ⊢ (𝑐 ∈ Cat → (InitO‘(oppCat‘𝑐)) = {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)}) |
15 | 14 | mpteq2ia 5126 | . 2 ⊢ (𝑐 ∈ Cat ↦ (InitO‘(oppCat‘𝑐))) = (𝑐 ∈ Cat ↦ {𝑎 ∈ (Base‘𝑐) ∣ ∀𝑏 ∈ (Base‘𝑐)∃!ℎ ℎ ∈ (𝑏(Hom ‘𝑐)𝑎)}) |
16 | 1, 15 | eqtr4i 2784 | 1 ⊢ TermO = (𝑐 ∈ Cat ↦ (InitO‘(oppCat‘𝑐))) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ∈ wcel 2111 ∃!weu 2587 ∀wral 3070 {crab 3074 ↦ cmpt 5115 ‘cfv 6339 (class class class)co 7155 Basecbs 16546 Hom chom 16639 Catccat 16998 oppCatcoppc 17044 InitOcinito 17312 TermOctermo 17313 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-rep 5159 ax-sep 5172 ax-nul 5179 ax-pow 5237 ax-pr 5301 ax-un 7464 ax-cnex 10636 ax-resscn 10637 ax-1cn 10638 ax-icn 10639 ax-addcl 10640 ax-addrcl 10641 ax-mulcl 10642 ax-mulrcl 10643 ax-mulcom 10644 ax-addass 10645 ax-mulass 10646 ax-distr 10647 ax-i2m1 10648 ax-1ne0 10649 ax-1rid 10650 ax-rnegex 10651 ax-rrecex 10652 ax-cnre 10653 ax-pre-lttri 10654 ax-pre-lttrn 10655 ax-pre-ltadd 10656 ax-pre-mulgt0 10657 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-reu 3077 df-rmo 3078 df-rab 3079 df-v 3411 df-sbc 3699 df-csb 3808 df-dif 3863 df-un 3865 df-in 3867 df-ss 3877 df-pss 3879 df-nul 4228 df-if 4424 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4802 df-iun 4888 df-br 5036 df-opab 5098 df-mpt 5116 df-tr 5142 df-id 5433 df-eprel 5438 df-po 5446 df-so 5447 df-fr 5486 df-we 5488 df-xp 5533 df-rel 5534 df-cnv 5535 df-co 5536 df-dm 5537 df-rn 5538 df-res 5539 df-ima 5540 df-pred 6130 df-ord 6176 df-on 6177 df-lim 6178 df-suc 6179 df-iota 6298 df-fun 6341 df-fn 6342 df-f 6343 df-f1 6344 df-fo 6345 df-f1o 6346 df-fv 6347 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-om 7585 df-1st 7698 df-2nd 7699 df-tpos 7907 df-wrecs 7962 df-recs 8023 df-rdg 8061 df-er 8304 df-en 8533 df-dom 8534 df-sdom 8535 df-pnf 10720 df-mnf 10721 df-xr 10722 df-ltxr 10723 df-le 10724 df-sub 10915 df-neg 10916 df-nn 11680 df-2 11742 df-3 11743 df-4 11744 df-5 11745 df-6 11746 df-7 11747 df-8 11748 df-9 11749 df-n0 11940 df-z 12026 df-dec 12143 df-ndx 16549 df-slot 16550 df-base 16552 df-sets 16553 df-hom 16652 df-cco 16653 df-cat 17002 df-cid 17003 df-oppc 17045 df-inito 17315 df-termo 17316 |
This theorem is referenced by: dftermo3 17337 |
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