mxidlmaxv - Mathbox for Thierry Arnoux

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Theorem mxidlmaxv 33446

Description: An ideal 𝐼 strictly containing a maximal ideal 𝑀 is the whole ring 𝐵. (Contributed by Thierry Arnoux, 9-Mar-2025.)

**Hypotheses**
Ref	Expression
mxidlmaxv.1	⊢ 𝐵 = (Base‘𝑅)
mxidlmaxv.2	⊢ (𝜑 → 𝑅 ∈ Ring)
mxidlmaxv.3	⊢ (𝜑 → 𝑀 ∈ (MaxIdeal‘𝑅))
mxidlmaxv.4	⊢ (𝜑 → 𝐼 ∈ (LIdeal‘𝑅))
mxidlmaxv.5	⊢ (𝜑 → 𝑀 ⊆ 𝐼)
mxidlmaxv.6	⊢ (𝜑 → 𝑋 ∈ (𝐼 ∖ 𝑀))

**Assertion**
Ref	Expression
mxidlmaxv	⊢ (𝜑 → 𝐼 = 𝐵)

**Proof of Theorem mxidlmaxv**
Step	Hyp	Ref	Expression
1		mxidlmaxv.2	. . 3 ⊢ (𝜑 → 𝑅 ∈ Ring)
2		mxidlmaxv.3	. . 3 ⊢ (𝜑 → 𝑀 ∈ (MaxIdeal‘𝑅))
3		mxidlmaxv.4	. . 3 ⊢ (𝜑 → 𝐼 ∈ (LIdeal‘𝑅))
4		mxidlmaxv.5	. . 3 ⊢ (𝜑 → 𝑀 ⊆ 𝐼)
5		mxidlmaxv.1	. . . 4 ⊢ 𝐵 = (Base‘𝑅)
6	5	mxidlmax 33443	. . 3 ⊢ (((𝑅 ∈ Ring ∧ 𝑀 ∈ (MaxIdeal‘𝑅)) ∧ (𝐼 ∈ (LIdeal‘𝑅) ∧ 𝑀 ⊆ 𝐼)) → (𝐼 = 𝑀 ∨ 𝐼 = 𝐵))
7	1, 2, 3, 4, 6	syl22anc 838	. 2 ⊢ (𝜑 → (𝐼 = 𝑀 ∨ 𝐼 = 𝐵))
8		mxidlmaxv.6	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ (𝐼 ∖ 𝑀))
9	8	eldifad 3929	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝐼)
10	8	eldifbd 3930	. . . 4 ⊢ (𝜑 → ¬ 𝑋 ∈ 𝑀)
11		nelne1 3023	. . . 4 ⊢ ((𝑋 ∈ 𝐼 ∧ ¬ 𝑋 ∈ 𝑀) → 𝐼 ≠ 𝑀)
12	9, 10, 11	syl2anc 584	. . 3 ⊢ (𝜑 → 𝐼 ≠ 𝑀)
13	12	neneqd 2931	. 2 ⊢ (𝜑 → ¬ 𝐼 = 𝑀)
14	7, 13	orcnd 878	1 ⊢ (𝜑 → 𝐼 = 𝐵)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∨ wo 847 = wceq 1540 ∈ wcel 2109 ≠ wne 2926 ∖ cdif 3914 ⊆ wss 3917 ‘cfv 6514 Basecbs 17186 Ringcrg 20149 LIdealclidl 21123 MaxIdealcmxidl 33437

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pr 5390

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-br 5111 df-opab 5173 df-mpt 5192 df-id 5536 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-iota 6467 df-fun 6516 df-fv 6522 df-mxidl 33438

This theorem is referenced by: mxidlirredi 33449 qsdrngilem 33472

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