lanval2 - Mathbox for Zhi Wang

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Theorem lanval2 49738

Description: The set of left Kan extensions is the set of universal pairs. Therefore, the explicit universal property can be recovered by isup2 49305 and upciclem1 49277. (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 49736	. . . 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 17870	. . . . . . . 8 ⊢ (𝐶 Func 𝐸) = (Base‘𝑆)
9	8	uprcl 49295	. . . . . . 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 2740	. . . . . 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 49730	. . . 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 2834	. . 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 2729	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 2111 ⟨cop 4579 (class class class)co 7346 Func cfunc 17761 FuncCat cfuc 17852 UP cup 49284 −∘_F cprcof 49484 Lan clan 49716

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 5215 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083

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-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-tp 4578 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-tr 5197 df-id 5509 df-eprel 5514 df-po 5522 df-so 5523 df-fr 5567 df-we 5569 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 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-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-uz 12733 df-fz 13408 df-struct 17058 df-slot 17093 df-ndx 17105 df-base 17121 df-hom 17185 df-cco 17186 df-func 17765 df-fuc 17854 df-up 49285 df-lan 49718

This theorem is referenced by: cmdlan 49783

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