Theorem 0mhm 18866

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 2765	. . . . . 6 ⊢ (Base‘𝑁) = (Base‘𝑁)
3		0mhm.z	. . . . . 6 ⊢ 0 = (0g‘𝑁)
4	2, 3	mndidcl 18795	. . . . 5 ⊢ (𝑁 ∈ Mnd → 0 ∈ (Base‘𝑁))
5	4	adantl 486	. . . 4 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 0 ∈ (Base‘𝑁))
6		fconst6g 6757	. . . 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 2765	. . . . . . . . 9 ⊢ (+g‘𝑁) = (+g‘𝑁)
10	2, 9, 3	mndlid 18800	. . . . . . . 8 ⊢ ((𝑁 ∈ Mnd ∧ 0 ∈ (Base‘𝑁)) → ( 0 (+g‘𝑁) 0 ) = 0 )
11	10	eqcomd 2771	. . . . . . 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 2765	. . . . . . . . 9 ⊢ (+g‘𝑀) = (+g‘𝑀)
16	14, 15	mndcl 18788	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥(+g‘𝑀)𝑦) ∈ 𝐵)
17	16	3expb 1136	. . . . . . 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 6885	. . . . . . 7 ⊢ 0 ∈ V
20	19	fvconst2 7192	. . . . . 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 7192	. . . . . . 7 ⊢ (𝑥 ∈ 𝐵 → ((𝐵 × { 0 })‘𝑥) = 0 )
23	19	fvconst2 7192	. . . . . . 7 ⊢ (𝑦 ∈ 𝐵 → ((𝐵 × { 0 })‘𝑦) = 0 )
24	22, 23	oveqan12d 7419	. . . . . 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 2810	. . . 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 2765	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑀)
29	14, 28	mndidcl 18795	. . . . 5 ⊢ (𝑀 ∈ Mnd → (0g‘𝑀) ∈ 𝐵)
30	29	adantr 485	. . . 4 ⊢ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (0g‘𝑀) ∈ 𝐵)
31	19	fvconst2 7192	. . . 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 1144	. 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 18831	. 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 1101   = wceq 1563   ∈ wcel 2145  ∀wral 3079  {csn 4585   × cxp 5649  ⟶wf 6521  ‘cfv 6525  (class class class)co 7400  Basecbs 17257  +_gcplusg 17298  0_gc0g 17480  Mndcmnd 18780   MndHom cmhm 18827

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2737  ax-sep 5250  ax-nul 5260  ax-pow 5326  ax-pr 5394  ax-un 7722

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-nf 1807  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3080  df-rex 3090  df-rmo 3370  df-reu 3371  df-rab 3418  df-v 3459  df-sbc 3748  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-nul 4289  df-if 4484  df-pw 4560  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5105  df-opab 5167  df-mpt 5186  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-iota 6481  df-fun 6527  df-fn 6528  df-f 6529  df-fv 6533  df-riota 7357  df-ov 7403  df-oprab 7404  df-mpo 7405  df-map 8814  df-0g 17482  df-mgm 18686  df-sgrp 18765  df-mnd 18781  df-mhm 18829

This theorem is referenced by:  0ghm  19288