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Theorem 0mhm 18699
Description: The constant zero linear function between two monoids. (Contributed by Stefan O'Rear, 5-Sep-2015.)
Hypotheses
Ref Expression
0mhm.z 0 = (0g𝑁)
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.
StepHypRef Expression
1 id 22 . 2 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd))
2 eqid 2732 . . . . . 6 (Base‘𝑁) = (Base‘𝑁)
3 0mhm.z . . . . . 6 0 = (0g𝑁)
42, 3mndidcl 18639 . . . . 5 (𝑁 ∈ Mnd → 0 ∈ (Base‘𝑁))
54adantl 482 . . . 4 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 0 ∈ (Base‘𝑁))
6 fconst6g 6780 . . . 4 ( 0 ∈ (Base‘𝑁) → (𝐵 × { 0 }):𝐵⟶(Base‘𝑁))
75, 6syl 17 . . 3 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝐵 × { 0 }):𝐵⟶(Base‘𝑁))
8 simpr 485 . . . . . . 7 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 𝑁 ∈ Mnd)
9 eqid 2732 . . . . . . . . 9 (+g𝑁) = (+g𝑁)
102, 9, 3mndlid 18644 . . . . . . . 8 ((𝑁 ∈ Mnd ∧ 0 ∈ (Base‘𝑁)) → ( 0 (+g𝑁) 0 ) = 0 )
1110eqcomd 2738 . . . . . . 7 ((𝑁 ∈ Mnd ∧ 0 ∈ (Base‘𝑁)) → 0 = ( 0 (+g𝑁) 0 ))
128, 4, 11syl2anc2 585 . . . . . 6 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → 0 = ( 0 (+g𝑁) 0 ))
1312adantr 481 . . . . 5 (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥𝐵𝑦𝐵)) → 0 = ( 0 (+g𝑁) 0 ))
14 0mhm.b . . . . . . . . 9 𝐵 = (Base‘𝑀)
15 eqid 2732 . . . . . . . . 9 (+g𝑀) = (+g𝑀)
1614, 15mndcl 18632 . . . . . . . 8 ((𝑀 ∈ Mnd ∧ 𝑥𝐵𝑦𝐵) → (𝑥(+g𝑀)𝑦) ∈ 𝐵)
17163expb 1120 . . . . . . 7 ((𝑀 ∈ Mnd ∧ (𝑥𝐵𝑦𝐵)) → (𝑥(+g𝑀)𝑦) ∈ 𝐵)
1817adantlr 713 . . . . . 6 (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥𝐵𝑦𝐵)) → (𝑥(+g𝑀)𝑦) ∈ 𝐵)
193fvexi 6905 . . . . . . 7 0 ∈ V
2019fvconst2 7204 . . . . . 6 ((𝑥(+g𝑀)𝑦) ∈ 𝐵 → ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = 0 )
2118, 20syl 17 . . . . 5 (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥𝐵𝑦𝐵)) → ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = 0 )
2219fvconst2 7204 . . . . . . 7 (𝑥𝐵 → ((𝐵 × { 0 })‘𝑥) = 0 )
2319fvconst2 7204 . . . . . . 7 (𝑦𝐵 → ((𝐵 × { 0 })‘𝑦) = 0 )
2422, 23oveqan12d 7427 . . . . . 6 ((𝑥𝐵𝑦𝐵) → (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)) = ( 0 (+g𝑁) 0 ))
2524adantl 482 . . . . 5 (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥𝐵𝑦𝐵)) → (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)) = ( 0 (+g𝑁) 0 ))
2613, 21, 253eqtr4d 2782 . . . 4 (((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ (𝑥𝐵𝑦𝐵)) → ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)))
2726ralrimivva 3200 . . 3 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ∀𝑥𝐵𝑦𝐵 ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)))
28 eqid 2732 . . . . . 6 (0g𝑀) = (0g𝑀)
2914, 28mndidcl 18639 . . . . 5 (𝑀 ∈ Mnd → (0g𝑀) ∈ 𝐵)
3029adantr 481 . . . 4 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (0g𝑀) ∈ 𝐵)
3119fvconst2 7204 . . . 4 ((0g𝑀) ∈ 𝐵 → ((𝐵 × { 0 })‘(0g𝑀)) = 0 )
3230, 31syl 17 . . 3 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ((𝐵 × { 0 })‘(0g𝑀)) = 0 )
337, 27, 323jca 1128 . 2 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → ((𝐵 × { 0 }):𝐵⟶(Base‘𝑁) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)) ∧ ((𝐵 × { 0 })‘(0g𝑀)) = 0 ))
3414, 2, 15, 9, 28, 3ismhm 18672 . 2 ((𝐵 × { 0 }) ∈ (𝑀 MndHom 𝑁) ↔ ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) ∧ ((𝐵 × { 0 }):𝐵⟶(Base‘𝑁) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐵 × { 0 })‘(𝑥(+g𝑀)𝑦)) = (((𝐵 × { 0 })‘𝑥)(+g𝑁)((𝐵 × { 0 })‘𝑦)) ∧ ((𝐵 × { 0 })‘(0g𝑀)) = 0 )))
351, 33, 34sylanbrc 583 1 ((𝑀 ∈ Mnd ∧ 𝑁 ∈ Mnd) → (𝐵 × { 0 }) ∈ (𝑀 MndHom 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  w3a 1087   = wceq 1541  wcel 2106  wral 3061  {csn 4628   × cxp 5674  wf 6539  cfv 6543  (class class class)co 7408  Basecbs 17143  +gcplusg 17196  0gc0g 17384  Mndcmnd 18624   MndHom cmhm 18668
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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rmo 3376  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3778  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-fv 6551  df-riota 7364  df-ov 7411  df-oprab 7412  df-mpo 7413  df-map 8821  df-0g 17386  df-mgm 18560  df-sgrp 18609  df-mnd 18625  df-mhm 18670
This theorem is referenced by:  0ghm  19105
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