Theorem 0subm 18785

Description: The zero submonoid of an arbitrary monoid. (Contributed by AV, 17-Feb-2024.)

Hypothesis

Ref	Expression
0subm.z	⊢ 0 = (0g‘𝐺)

Assertion

Ref	Expression
0subm	⊢ (𝐺 ∈ Mnd → { 0 } ∈ (SubMnd‘𝐺))

Proof of Theorem 0subm

Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2736	. . . 4 ⊢ (Base‘𝐺) = (Base‘𝐺)
2		0subm.z	. . . 4 ⊢ 0 = (0g‘𝐺)
3	1, 2	mndidcl 18717	. . 3 ⊢ (𝐺 ∈ Mnd → 0 ∈ (Base‘𝐺))
4	3	snssd 4730	. 2 ⊢ (𝐺 ∈ Mnd → { 0 } ⊆ (Base‘𝐺))
5	2	fvexi 6854	. . . 4 ⊢ 0 ∈ V
6	5	snid 4606	. . 3 ⊢ 0 ∈ { 0 }
7	6	a1i 11	. 2 ⊢ (𝐺 ∈ Mnd → 0 ∈ { 0 })
8		velsn 4583	. . . . 5 ⊢ (𝑎 ∈ { 0 } ↔ 𝑎 = 0 )
9		velsn 4583	. . . . 5 ⊢ (𝑏 ∈ { 0 } ↔ 𝑏 = 0 )
10	8, 9	anbi12i 629	. . . 4 ⊢ ((𝑎 ∈ { 0 } ∧ 𝑏 ∈ { 0 }) ↔ (𝑎 = 0 ∧ 𝑏 = 0 ))
11		eqid 2736	. . . . . . . 8 ⊢ (+g‘𝐺) = (+g‘𝐺)
12	1, 11, 2	mndlid 18722	. . . . . . 7 ⊢ ((𝐺 ∈ Mnd ∧ 0 ∈ (Base‘𝐺)) → ( 0 (+g‘𝐺) 0 ) = 0 )
13	3, 12	mpdan 688	. . . . . 6 ⊢ (𝐺 ∈ Mnd → ( 0 (+g‘𝐺) 0 ) = 0 )
14		ovex 7400	. . . . . . 7 ⊢ ( 0 (+g‘𝐺) 0 ) ∈ V
15	14	elsn 4582	. . . . . 6 ⊢ (( 0 (+g‘𝐺) 0 ) ∈ { 0 } ↔ ( 0 (+g‘𝐺) 0 ) = 0 )
16	13, 15	sylibr 234	. . . . 5 ⊢ (𝐺 ∈ Mnd → ( 0 (+g‘𝐺) 0 ) ∈ { 0 })
17		oveq12 7376	. . . . . 6 ⊢ ((𝑎 = 0 ∧ 𝑏 = 0 ) → (𝑎(+g‘𝐺)𝑏) = ( 0 (+g‘𝐺) 0 ))
18	17	eleq1d 2821	. . . . 5 ⊢ ((𝑎 = 0 ∧ 𝑏 = 0 ) → ((𝑎(+g‘𝐺)𝑏) ∈ { 0 } ↔ ( 0 (+g‘𝐺) 0 ) ∈ { 0 }))
19	16, 18	syl5ibrcom 247	. . . 4 ⊢ (𝐺 ∈ Mnd → ((𝑎 = 0 ∧ 𝑏 = 0 ) → (𝑎(+g‘𝐺)𝑏) ∈ { 0 }))
20	10, 19	biimtrid 242	. . 3 ⊢ (𝐺 ∈ Mnd → ((𝑎 ∈ { 0 } ∧ 𝑏 ∈ { 0 }) → (𝑎(+g‘𝐺)𝑏) ∈ { 0 }))
21	20	ralrimivv 3178	. 2 ⊢ (𝐺 ∈ Mnd → ∀𝑎 ∈ { 0 }∀𝑏 ∈ { 0 } (𝑎(+g‘𝐺)𝑏) ∈ { 0 })
22	1, 2, 11	issubm 18771	. 2 ⊢ (𝐺 ∈ Mnd → ({ 0 } ∈ (SubMnd‘𝐺) ↔ ({ 0 } ⊆ (Base‘𝐺) ∧ 0 ∈ { 0 } ∧ ∀𝑎 ∈ { 0 }∀𝑏 ∈ { 0 } (𝑎(+g‘𝐺)𝑏) ∈ { 0 })))
23	4, 7, 21, 22	mpbir3and 1344	1 ⊢ (𝐺 ∈ Mnd → { 0 } ∈ (SubMnd‘𝐺))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1542   ∈ wcel 2114  ∀wral 3051   ⊆ wss 3889  {csn 4567  ‘cfv 6498  (class class class)co 7367  Basecbs 17179  +_gcplusg 17220  0_gc0g 17402  Mndcmnd 18702  SubMndcsubmnd 18750

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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rmo 3342  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-iota 6454  df-fun 6500  df-fv 6506  df-riota 7324  df-ov 7370  df-0g 17404  df-mgm 18608  df-sgrp 18687  df-mnd 18703  df-submnd 18752

This theorem is referenced by:  idressubmefmnd  18866  0subg  19127  0subgALT  19543