Theorem 0mhm 18873

Description: The constant zero linear function between two monoids. (Contributed by Stefan O'Rear, 5-Sep-2015.)

Hypotheses

Ref	Expression
0mhm.z	⊢ 0 = (0g‘𝑁)
0mhm.b	⊢ 𝐵 = (Base‘𝑀)

Assertion

Ref	Expression
0mhm	⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝐵 × { 0 }) ∈ (𝑀 MndHom 𝑁))

Proof of Theorem 0mhm

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		id 23	. 2 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd))
2		eqid 2763	. . . . . 6 ⊢ (Base‘𝑁) = (Base‘𝑁)
3		0mhm.z	. . . . . 6 ⊢ 0 = (0g‘𝑁)
4	2, 3	mndidcl 18802	. . . . 5 ⊢ (𝑁 ∈ Mnd → 0 ∈ (Base‘𝑁))
5	4	adantl 486	. . . 4 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 0 ∈ (Base‘𝑁))
6		fconst6g 6767	. . . 4 ⊢ ( 0 ∈ (Base‘𝑁) → (𝐵 × { 0 }):𝐵⟶(Base‘𝑁))
7	5, 6	syl 18	. . 3 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝐵 × { 0 }):𝐵⟶(Base‘𝑁))
8		simpr 489	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 𝑁 ∈ Mnd)
9		eqid 2763	. . . . . . . . 9 ⊢ (+g‘𝑁) = (+g‘𝑁)
10	2, 9, 3	mndlid 18807	. . . . . . . 8 ⊢ ((𝑁 ∈ Mnd ∧ 0 ∈ (Base‘𝑁)) → ( 0 (+g‘𝑁) 0 ) = 0 )
11	10	eqcomd 2769	. . . . . . 7 ⊢ ((𝑁 ∈ Mnd ∧ 0 ∈ (Base‘𝑁)) → 0 = ( 0 (+g‘𝑁) 0 ))
12	8, 4, 11	syl2anc2 596	. . . . . 6 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 0 = ( 0 (+g‘𝑁) 0 ))
13	12	adantr 485	. . . . 5 ⊢ (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → 0 = ( 0 (+g‘𝑁) 0 ))
14		0mhm.b	. . . . . . . . 9 ⊢ 𝐵 = (Base‘𝑀)
15		eqid 2763	. . . . . . . . 9 ⊢ (+g‘𝑀) = (+g‘𝑀)
16	14, 15	mndcl 18795	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥(+g‘𝑀)𝑦) ∈ 𝐵)
17	16	3expb 1138	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → (𝑥(+g‘𝑀)𝑦) ∈ 𝐵)
18	17	adantlr 727	. . . . . 6 ⊢ (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → (𝑥(+g‘𝑀)𝑦) ∈ 𝐵)
19	3	fvexi 6895	. . . . . . 7 ⊢ 0 ∈ V
20	19	fvconst2 7202	. . . . . 6 ⊢ ((𝑥(+g‘𝑀)𝑦) ∈ 𝐵 → ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = 0 )
21	18, 20	syl 18	. . . . 5 ⊢ (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = 0 )
22	19	fvconst2 7202	. . . . . . 7 ⊢ (𝑥 ∈ 𝐵 → ((𝐵 × { 0 })‘𝑥) = 0 )
23	19	fvconst2 7202	. . . . . . 7 ⊢ (𝑦 ∈ 𝐵 → ((𝐵 × { 0 })‘𝑦) = 0 )
24	22, 23	oveqan12d 7429	. . . . . 6 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)) = ( 0 (+g‘𝑁) 0 ))
25	24	adantl 486	. . . . 5 ⊢ (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)) = ( 0 (+g‘𝑁) 0 ))
26	13, 21, 25	3eqtr4d 2808	. . . 4 ⊢ (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)))
27	26	ralrimivva 3208	. . 3 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)))
28		eqid 2763	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑀)
29	14, 28	mndidcl 18802	. . . . 5 ⊢ (𝑀 ∈ Mnd → (0g‘𝑀) ∈ 𝐵)
30	29	adantr 485	. . . 4 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (0g‘𝑀) ∈ 𝐵)
31	19	fvconst2 7202	. . . 4 ⊢ ((0g‘𝑀) ∈ 𝐵 → ((𝐵 × { 0 })‘(0g‘𝑀)) = 0 )
32	30, 31	syl 18	. . 3 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ((𝐵 × { 0 })‘(0g‘𝑀)) = 0 )
33	7, 27, 32	3jca 1146	. 2 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ((𝐵 × { 0 }):𝐵⟶(Base‘𝑁) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)) ∧ ((𝐵 × { 0 })‘(0g‘𝑀)) = 0 ))
34	14, 2, 15, 9, 28, 3	ismhm 18838	. 2 ⊢ ((𝐵 × { 0 }) ∈ (𝑀 MndHom 𝑁) ↔ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ ((𝐵 × { 0 }):𝐵⟶(Base‘𝑁) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ((𝐵 × { 0 })‘(𝑥(+g‘𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g‘𝑁)((𝐵 × { 0 })‘𝑦)) ∧ ((𝐵 × { 0 })‘(0g‘𝑀)) = 0 )))
35	1, 33, 34	sylanbrc 594	1 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝐵 × { 0 }) ∈ (𝑀 MndHom 𝑁))

Syntax hints:   → wi 4   ∧ wa 400   ∧ w3a 1103   = wceq 1570   ∈ wcel 2143  ∀wral 3079  {csn 4589   × cxp 5659  ⟶wf 6532  ‘cfv 6536  (class class class)co 7410  Basecbs 17264  +_gcplusg 17305  0_gc0g 17487  Mndcmnd 18787   MndHom cmhm 18834

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-nul 5269  ax-pow 5336  ax-pr 5404  ax-un 7732

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3457  df-sbc 3745  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-mpt 5193  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-fv 6544  df-riota 7367  df-ov 7413  df-oprab 7414  df-mpo 7415  df-map 8822  df-0g 17489  df-mgm 18693  df-sgrp 18772  df-mnd 18788  df-mhm 18836

This theorem is referenced by:  0ghm  19295