Theorem 0subm 18691

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 2729	. . . 4 ⊢ (Base‘𝐺) = (Base‘𝐺)
2		0subm.z	. . . 4 ⊢ 0 = (0g‘𝐺)
3	1, 2	mndidcl 18623	. . 3 ⊢ (𝐺 ∈ Mnd → 0 ∈ (Base‘𝐺))
4	3	snssd 4760	. 2 ⊢ (𝐺 ∈ Mnd → { 0 } ⊆ (Base‘𝐺))
5	2	fvexi 6836	. . . 4 ⊢ 0 ∈ V
6	5	snid 4614	. . 3 ⊢ 0 ∈ { 0 }
7	6	a1i 11	. 2 ⊢ (𝐺 ∈ Mnd → 0 ∈ { 0 })
8		velsn 4593	. . . . 5 ⊢ (𝑎 ∈ { 0 } ↔ 𝑎 = 0 )
9		velsn 4593	. . . . 5 ⊢ (𝑏 ∈ { 0 } ↔ 𝑏 = 0 )
10	8, 9	anbi12i 628	. . . 4 ⊢ ((𝑎 ∈ { 0 } ∧ 𝑏 ∈ { 0 }) ↔ (𝑎 = 0 ∧ 𝑏 = 0 ))
11		eqid 2729	. . . . . . . 8 ⊢ (+g‘𝐺) = (+g‘𝐺)
12	1, 11, 2	mndlid 18628	. . . . . . 7 ⊢ ((𝐺 ∈ Mnd ∧ 0 ∈ (Base‘𝐺)) → ( 0 (+g‘𝐺) 0 ) = 0 )
13	3, 12	mpdan 687	. . . . . 6 ⊢ (𝐺 ∈ Mnd → ( 0 (+g‘𝐺) 0 ) = 0 )
14		ovex 7382	. . . . . . 7 ⊢ ( 0 (+g‘𝐺) 0 ) ∈ V
15	14	elsn 4592	. . . . . 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 7358	. . . . . 6 ⊢ ((𝑎 = 0 ∧ 𝑏 = 0 ) → (𝑎(+g‘𝐺)𝑏) = ( 0 (+g‘𝐺) 0 ))
18	17	eleq1d 2813	. . . . 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 3170	. 2 ⊢ (𝐺 ∈ Mnd → ∀𝑎 ∈ { 0 }∀𝑏 ∈ { 0 } (𝑎(+g‘𝐺)𝑏) ∈ { 0 })
22	1, 2, 11	issubm 18677	. 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 1343	1 ⊢ (𝐺 ∈ Mnd → { 0 } ∈ (SubMnd‘𝐺))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∀wral 3044   ⊆ wss 3903  {csn 4577  ‘cfv 6482  (class class class)co 7349  Basecbs 17120  +_gcplusg 17161  0_gc0g 17343  Mndcmnd 18608  SubMndcsubmnd 18656

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 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371

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 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-iota 6438  df-fun 6484  df-fv 6490  df-riota 7306  df-ov 7352  df-0g 17345  df-mgm 18514  df-sgrp 18593  df-mnd 18609  df-submnd 18658

This theorem is referenced by:  idressubmefmnd  18772  0subg  19030  0subgALT  19447