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Theorem xpsmnd0 18670
Description: The identity element of a binary product of monoids. (Contributed by AV, 25-Feb-2025.)
Hypothesis
Ref Expression
xpsmnd0.t 𝑇 = (𝑅 ×s 𝑆)
Assertion
Ref Expression
xpsmnd0 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑇) = ⟨(0g𝑅), (0g𝑆)⟩)

Proof of Theorem xpsmnd0
Dummy variables 𝑎 𝑏 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2729 . . 3 (Base‘𝑇) = (Base‘𝑇)
2 eqid 2729 . . 3 (0g𝑇) = (0g𝑇)
3 eqid 2729 . . 3 (+g𝑇) = (+g𝑇)
4 eqid 2729 . . . . . . 7 (Base‘𝑅) = (Base‘𝑅)
5 eqid 2729 . . . . . . 7 (0g𝑅) = (0g𝑅)
64, 5mndidcl 18641 . . . . . 6 (𝑅 ∈ Mnd → (0g𝑅) ∈ (Base‘𝑅))
76adantr 480 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑅) ∈ (Base‘𝑅))
8 eqid 2729 . . . . . . 7 (Base‘𝑆) = (Base‘𝑆)
9 eqid 2729 . . . . . . 7 (0g𝑆) = (0g𝑆)
108, 9mndidcl 18641 . . . . . 6 (𝑆 ∈ Mnd → (0g𝑆) ∈ (Base‘𝑆))
1110adantl 481 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑆) ∈ (Base‘𝑆))
127, 11opelxpd 5662 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ ∈ ((Base‘𝑅) × (Base‘𝑆)))
13 xpsmnd0.t . . . . 5 𝑇 = (𝑅 ×s 𝑆)
14 simpl 482 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → 𝑅 ∈ Mnd)
15 simpr 484 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → 𝑆 ∈ Mnd)
1613, 4, 8, 14, 15xpsbas 17494 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ((Base‘𝑅) × (Base‘𝑆)) = (Base‘𝑇))
1712, 16eleqtrd 2830 . . 3 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ ∈ (Base‘𝑇))
1816eleq2d 2814 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) ↔ 𝑥 ∈ (Base‘𝑇)))
19 elxp2 5647 . . . . . 6 (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) ↔ ∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩)
2014adantr 480 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑅 ∈ Mnd)
2115adantr 480 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑆 ∈ Mnd)
227adantr 480 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (0g𝑅) ∈ (Base‘𝑅))
2311adantr 480 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (0g𝑆) ∈ (Base‘𝑆))
24 simpl 482 . . . . . . . . . . 11 ((𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆)) → 𝑎 ∈ (Base‘𝑅))
2524adantl 481 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑎 ∈ (Base‘𝑅))
26 simpr 484 . . . . . . . . . . 11 ((𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆)) → 𝑏 ∈ (Base‘𝑆))
2726adantl 481 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑏 ∈ (Base‘𝑆))
28 eqid 2729 . . . . . . . . . . . 12 (+g𝑅) = (+g𝑅)
294, 28mndcl 18634 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ (0g𝑅) ∈ (Base‘𝑅) ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
3020, 22, 25, 29syl3anc 1373 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
31 eqid 2729 . . . . . . . . . . . 12 (+g𝑆) = (+g𝑆)
328, 31mndcl 18634 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ (0g𝑆) ∈ (Base‘𝑆) ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) ∈ (Base‘𝑆))
3321, 23, 27, 32syl3anc 1373 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑆)(+g𝑆)𝑏) ∈ (Base‘𝑆))
3413, 4, 8, 20, 21, 22, 23, 25, 27, 30, 33, 28, 31, 3xpsadd 17496 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨((0g𝑅)(+g𝑅)𝑎), ((0g𝑆)(+g𝑆)𝑏)⟩)
354, 28, 5mndlid 18646 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
3614, 24, 35syl2an 596 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
378, 31, 9mndlid 18646 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3815, 26, 37syl2an 596 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3936, 38opeq12d 4835 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨((0g𝑅)(+g𝑅)𝑎), ((0g𝑆)(+g𝑆)𝑏)⟩ = ⟨𝑎, 𝑏⟩)
4034, 39eqtrd 2764 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨𝑎, 𝑏⟩)
41 oveq2 7361 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩))
42 id 22 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → 𝑥 = ⟨𝑎, 𝑏⟩)
4341, 42eqeq12d 2745 . . . . . . . 8 (𝑥 = ⟨𝑎, 𝑏⟩ → ((⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥 ↔ (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨𝑎, 𝑏⟩))
4440, 43syl5ibrcom 247 . . . . . . 7 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4544rexlimdvva 3186 . . . . . 6 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4619, 45biimtrid 242 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4718, 46sylbird 260 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ (Base‘𝑇) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4847imp 406 . . 3 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ 𝑥 ∈ (Base‘𝑇)) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥)
494, 28mndcl 18634 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅) ∧ (0g𝑅) ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
5020, 25, 22, 49syl3anc 1373 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
518, 31mndcl 18634 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆) ∧ (0g𝑆) ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) ∈ (Base‘𝑆))
5221, 27, 23, 51syl3anc 1373 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑏(+g𝑆)(0g𝑆)) ∈ (Base‘𝑆))
5313, 4, 8, 20, 21, 25, 27, 22, 23, 50, 52, 28, 31, 3xpsadd 17496 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨(𝑎(+g𝑅)(0g𝑅)), (𝑏(+g𝑆)(0g𝑆))⟩)
544, 28, 5mndrid 18647 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
5514, 24, 54syl2an 596 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
568, 31, 9mndrid 18647 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5715, 26, 56syl2an 596 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5855, 57opeq12d 4835 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨(𝑎(+g𝑅)(0g𝑅)), (𝑏(+g𝑆)(0g𝑆))⟩ = ⟨𝑎, 𝑏⟩)
5953, 58eqtrd 2764 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨𝑎, 𝑏⟩)
60 oveq1 7360 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩))
6160, 42eqeq12d 2745 . . . . . . . 8 (𝑥 = ⟨𝑎, 𝑏⟩ → ((𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥 ↔ (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨𝑎, 𝑏⟩))
6259, 61syl5ibrcom 247 . . . . . . 7 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6362rexlimdvva 3186 . . . . . 6 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6419, 63biimtrid 242 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6518, 64sylbird 260 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ (Base‘𝑇) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6665imp 406 . . 3 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ 𝑥 ∈ (Base‘𝑇)) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥)
671, 2, 3, 17, 48, 66ismgmid2 18560 . 2 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ = (0g𝑇))
6867eqcomd 2735 1 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑇) = ⟨(0g𝑅), (0g𝑆)⟩)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  wrex 3053  cop 4585   × cxp 5621  cfv 6486  (class class class)co 7353  Basecbs 17138  +gcplusg 17179  0gc0g 17361   ×s cxps 17428  Mndcmnd 18626
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-rep 5221  ax-sep 5238  ax-nul 5248  ax-pow 5307  ax-pr 5374  ax-un 7675  ax-cnex 11084  ax-resscn 11085  ax-1cn 11086  ax-icn 11087  ax-addcl 11088  ax-addrcl 11089  ax-mulcl 11090  ax-mulrcl 11091  ax-mulcom 11092  ax-addass 11093  ax-mulass 11094  ax-distr 11095  ax-i2m1 11096  ax-1ne0 11097  ax-1rid 11098  ax-rnegex 11099  ax-rrecex 11100  ax-cnre 11101  ax-pre-lttri 11102  ax-pre-lttrn 11103  ax-pre-ltadd 11104  ax-pre-mulgt0 11105
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  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-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3345  df-reu 3346  df-rab 3397  df-v 3440  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-tp 4584  df-op 4586  df-uni 4862  df-iun 4946  df-br 5096  df-opab 5158  df-mpt 5177  df-tr 5203  df-id 5518  df-eprel 5523  df-po 5531  df-so 5532  df-fr 5576  df-we 5578  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-pred 6253  df-ord 6314  df-on 6315  df-lim 6316  df-suc 6317  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-riota 7310  df-ov 7356  df-oprab 7357  df-mpo 7358  df-om 7807  df-1st 7931  df-2nd 7932  df-frecs 8221  df-wrecs 8252  df-recs 8301  df-rdg 8339  df-1o 8395  df-2o 8396  df-er 8632  df-map 8762  df-ixp 8832  df-en 8880  df-dom 8881  df-sdom 8882  df-fin 8883  df-sup 9351  df-inf 9352  df-pnf 11170  df-mnf 11171  df-xr 11172  df-ltxr 11173  df-le 11174  df-sub 11367  df-neg 11368  df-nn 12147  df-2 12209  df-3 12210  df-4 12211  df-5 12212  df-6 12213  df-7 12214  df-8 12215  df-9 12216  df-n0 12403  df-z 12490  df-dec 12610  df-uz 12754  df-fz 13429  df-struct 17076  df-slot 17111  df-ndx 17123  df-base 17139  df-plusg 17192  df-mulr 17193  df-sca 17195  df-vsca 17196  df-ip 17197  df-tset 17198  df-ple 17199  df-ds 17201  df-hom 17203  df-cco 17204  df-0g 17363  df-prds 17369  df-imas 17430  df-xps 17432  df-mgm 18532  df-sgrp 18611  df-mnd 18627
This theorem is referenced by:  xpsinv  18957  rngqiprngimf1  21225
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