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Theorem lubss 17121

Description: Subset law for least upper bounds. (chsupss 28201 analog.) (Contributed by NM, 20-Oct-2011.)

**Hypotheses**
Ref	Expression
lublem.b	⊢ 𝐵 = (Base‘𝐾)
lublem.l	⊢ ≤ = (le‘𝐾)
lublem.u	⊢ 𝑈 = (lub‘𝐾)

**Assertion**
Ref	Expression
lubss	⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → (𝑈‘𝑆) ≤ (𝑈‘𝑇))

Proof of Theorem lubss Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simp1 1061	. . 3 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → 𝐾 ∈ CLat)
2		sstr2 3610	. . . . 5 ⊢ (𝑆 ⊆ 𝑇 → (𝑇 ⊆ 𝐵 → 𝑆 ⊆ 𝐵))
3	2	impcom 446	. . . 4 ⊢ ((𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → 𝑆 ⊆ 𝐵)
4	3	3adant1 1079	. . 3 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → 𝑆 ⊆ 𝐵)
5		lublem.b	. . . . 5 ⊢ 𝐵 = (Base‘𝐾)
6		lublem.u	. . . . 5 ⊢ 𝑈 = (lub‘𝐾)
7	5, 6	clatlubcl 17112	. . . 4 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵) → (𝑈‘𝑇) ∈ 𝐵)
8	7	3adant3 1081	. . 3 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → (𝑈‘𝑇) ∈ 𝐵)
9	1, 4, 8	3jca 1242	. 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → (𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵 ∧ (𝑈‘𝑇) ∈ 𝐵))
10		simpl1 1064	. . . 4 ⊢ (((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) ∧ 𝑦 ∈ 𝑆) → 𝐾 ∈ CLat)
11		simpl2 1065	. . . 4 ⊢ (((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) ∧ 𝑦 ∈ 𝑆) → 𝑇 ⊆ 𝐵)
12		ssel2 3598	. . . . 5 ⊢ ((𝑆 ⊆ 𝑇 ∧ 𝑦 ∈ 𝑆) → 𝑦 ∈ 𝑇)
13	12	3ad2antl3 1225	. . . 4 ⊢ (((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) ∧ 𝑦 ∈ 𝑆) → 𝑦 ∈ 𝑇)
14		lublem.l	. . . . 5 ⊢ ≤ = (le‘𝐾)
15	5, 14, 6	lubub 17119	. . . 4 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑦 ∈ 𝑇) → 𝑦 ≤ (𝑈‘𝑇))
16	10, 11, 13, 15	syl3anc 1326	. . 3 ⊢ (((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) ∧ 𝑦 ∈ 𝑆) → 𝑦 ≤ (𝑈‘𝑇))
17	16	ralrimiva 2966	. 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → ∀𝑦 ∈ 𝑆 𝑦 ≤ (𝑈‘𝑇))
18	5, 14, 6	lubl 17120	. 2 ⊢ ((𝐾 ∈ CLat ∧ 𝑆 ⊆ 𝐵 ∧ (𝑈‘𝑇) ∈ 𝐵) → (∀𝑦 ∈ 𝑆 𝑦 ≤ (𝑈‘𝑇) → (𝑈‘𝑆) ≤ (𝑈‘𝑇)))
19	9, 17, 18	sylc 65	1 ⊢ ((𝐾 ∈ CLat ∧ 𝑇 ⊆ 𝐵 ∧ 𝑆 ⊆ 𝑇) → (𝑈‘𝑆) ≤ (𝑈‘𝑇))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 384 ∧ w3a 1037 = wceq 1483 ∈ wcel 1990 ∀wral 2912 ⊆ wss 3574 class class class wbr 4653 ‘cfv 5888 Basecbs 15857 lecple 15948 lubclub 16942 CLatccla 17107

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-lub 16974 df-glb 16975 df-clat 17108

This theorem is referenced by: lubel 17122 atlatmstc 34606 atlatle 34607 pmaple 35047 paddunN 35213 poml4N 35239

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