lanval2 - Mathbox for Zhi Wang

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Theorem lanval2 49752

Description: The set of left Kan extensions is the set of universal pairs. Therefore, the explicit universal property can be recovered by isup2 49319 and upciclem1 49291. (Contributed by Zhi Wang, 3-Nov-2025.)

**Hypotheses**
Ref	Expression
islan.r	⊢ 𝑅 = (𝐷 FuncCat 𝐸)
islan.s	⊢ 𝑆 = (𝐶 FuncCat 𝐸)
islan.k	⊢ 𝐾 = (⟨𝐷, 𝐸⟩ −∘_F 𝐹)

**Assertion**
Ref	Expression
lanval2	⊢ (𝐹 ∈ (𝐶 Func 𝐷) → (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋) = (𝐾(𝑅 UP 𝑆)𝑋))

Proof of Theorem lanval2 Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		islan.r	. . . . 5 ⊢ 𝑅 = (𝐷 FuncCat 𝐸)
2		islan.s	. . . . 5 ⊢ 𝑆 = (𝐶 FuncCat 𝐸)
3		islan.k	. . . . 5 ⊢ 𝐾 = (⟨𝐷, 𝐸⟩ −∘_F 𝐹)
4	1, 2, 3	islan 49750	. . . 4 ⊢ (𝑥 ∈ (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋) → 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋))
5	4	adantl 481	. . 3 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋)) → 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋))
6		simpr 484	. . . 4 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋))
7		simpl 482	. . . . 5 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → 𝐹 ∈ (𝐶 Func 𝐷))
8	2	fucbas 17872	. . . . . . . 8 ⊢ (𝐶 Func 𝐸) = (Base‘𝑆)
9	8	uprcl 49309	. . . . . . 7 ⊢ (𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋) → (𝐾 ∈ (𝑅 Func 𝑆) ∧ 𝑋 ∈ (𝐶 Func 𝐸)))
10	9	simprd 495	. . . . . 6 ⊢ (𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋) → 𝑋 ∈ (𝐶 Func 𝐸))
11	10	adantl 481	. . . . 5 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → 𝑋 ∈ (𝐶 Func 𝐸))
12	3	eqcomi 2742	. . . . . 6 ⊢ (⟨𝐷, 𝐸⟩ −∘_F 𝐹) = 𝐾
13	12	a1i 11	. . . . 5 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → (⟨𝐷, 𝐸⟩ −∘_F 𝐹) = 𝐾)
14	1, 2, 7, 11, 13	lanval 49744	. . . 4 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋) = (𝐾(𝑅 UP 𝑆)𝑋))
15	6, 14	eleqtrrd 2836	. . 3 ⊢ ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)) → 𝑥 ∈ (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋))
16	5, 15	impbida 800	. 2 ⊢ (𝐹 ∈ (𝐶 Func 𝐷) → (𝑥 ∈ (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋) ↔ 𝑥 ∈ (𝐾(𝑅 UP 𝑆)𝑋)))
17	16	eqrdv 2731	1 ⊢ (𝐹 ∈ (𝐶 Func 𝐷) → (𝐹(⟨𝐶, 𝐷⟩ Lan 𝐸)𝑋) = (𝐾(𝑅 UP 𝑆)𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ⟨cop 4581 (class class class)co 7352 Func cfunc 17763 FuncCat cfuc 17854 UP cup 49298 −∘_F cprcof 49498 Lan clan 49730

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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-rep 5219 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674 ax-cnex 11069 ax-resscn 11070 ax-1cn 11071 ax-icn 11072 ax-addcl 11073 ax-addrcl 11074 ax-mulcl 11075 ax-mulrcl 11076 ax-mulcom 11077 ax-addass 11078 ax-mulass 11079 ax-distr 11080 ax-i2m1 11081 ax-1ne0 11082 ax-1rid 11083 ax-rnegex 11084 ax-rrecex 11085 ax-cnre 11086 ax-pre-lttri 11087 ax-pre-lttrn 11088 ax-pre-ltadd 11089 ax-pre-mulgt0 11090

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 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-nel 3034 df-ral 3049 df-rex 3058 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-tp 4580 df-op 4582 df-uni 4859 df-iun 4943 df-br 5094 df-opab 5156 df-mpt 5175 df-tr 5201 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 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 7309 df-ov 7355 df-oprab 7356 df-mpo 7357 df-om 7803 df-1st 7927 df-2nd 7928 df-frecs 8217 df-wrecs 8248 df-recs 8297 df-rdg 8335 df-1o 8391 df-er 8628 df-en 8876 df-dom 8877 df-sdom 8878 df-fin 8879 df-pnf 11155 df-mnf 11156 df-xr 11157 df-ltxr 11158 df-le 11159 df-sub 11353 df-neg 11354 df-nn 12133 df-2 12195 df-3 12196 df-4 12197 df-5 12198 df-6 12199 df-7 12200 df-8 12201 df-9 12202 df-n0 12389 df-z 12476 df-dec 12595 df-uz 12739 df-fz 13410 df-struct 17060 df-slot 17095 df-ndx 17107 df-base 17123 df-hom 17187 df-cco 17188 df-func 17767 df-fuc 17856 df-up 49299 df-lan 49732

This theorem is referenced by: cmdlan 49797

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