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Theorem xpsmnd0 18746
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 2736 . . 3 (Base‘𝑇) = (Base‘𝑇)
2 eqid 2736 . . 3 (0g𝑇) = (0g𝑇)
3 eqid 2736 . . 3 (+g𝑇) = (+g𝑇)
4 eqid 2736 . . . . . . 7 (Base‘𝑅) = (Base‘𝑅)
5 eqid 2736 . . . . . . 7 (0g𝑅) = (0g𝑅)
64, 5mndidcl 18717 . . . . . 6 (𝑅 ∈ Mnd → (0g𝑅) ∈ (Base‘𝑅))
76adantr 480 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑅) ∈ (Base‘𝑅))
8 eqid 2736 . . . . . . 7 (Base‘𝑆) = (Base‘𝑆)
9 eqid 2736 . . . . . . 7 (0g𝑆) = (0g𝑆)
108, 9mndidcl 18717 . . . . . 6 (𝑆 ∈ Mnd → (0g𝑆) ∈ (Base‘𝑆))
1110adantl 481 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑆) ∈ (Base‘𝑆))
127, 11opelxpd 5670 . . . 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 17536 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ((Base‘𝑅) × (Base‘𝑆)) = (Base‘𝑇))
1712, 16eleqtrd 2838 . . 3 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ ∈ (Base‘𝑇))
1816eleq2d 2822 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) ↔ 𝑥 ∈ (Base‘𝑇)))
19 elxp2 5655 . . . . . 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 2736 . . . . . . . . . . . 12 (+g𝑅) = (+g𝑅)
294, 28mndcl 18710 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ (0g𝑅) ∈ (Base‘𝑅) ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
3020, 22, 25, 29syl3anc 1374 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
31 eqid 2736 . . . . . . . . . . . 12 (+g𝑆) = (+g𝑆)
328, 31mndcl 18710 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ (0g𝑆) ∈ (Base‘𝑆) ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) ∈ (Base‘𝑆))
3321, 23, 27, 32syl3anc 1374 . . . . . . . . . 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 17538 . . . . . . . . 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 18722 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
3614, 24, 35syl2an 597 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
378, 31, 9mndlid 18722 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3815, 26, 37syl2an 597 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3936, 38opeq12d 4824 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨((0g𝑅)(+g𝑅)𝑎), ((0g𝑆)(+g𝑆)𝑏)⟩ = ⟨𝑎, 𝑏⟩)
4034, 39eqtrd 2771 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨𝑎, 𝑏⟩)
41 oveq2 7375 . . . . . . . . 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 2752 . . . . . . . 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 3194 . . . . . 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 18710 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅) ∧ (0g𝑅) ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
5020, 25, 22, 49syl3anc 1374 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
518, 31mndcl 18710 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆) ∧ (0g𝑆) ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) ∈ (Base‘𝑆))
5221, 27, 23, 51syl3anc 1374 . . . . . . . . . 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 17538 . . . . . . . . 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 18723 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
5514, 24, 54syl2an 597 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
568, 31, 9mndrid 18723 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5715, 26, 56syl2an 597 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5855, 57opeq12d 4824 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨(𝑎(+g𝑅)(0g𝑅)), (𝑏(+g𝑆)(0g𝑆))⟩ = ⟨𝑎, 𝑏⟩)
5953, 58eqtrd 2771 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨𝑎, 𝑏⟩)
60 oveq1 7374 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩))
6160, 42eqeq12d 2752 . . . . . . . 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 3194 . . . . . 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 18636 . 2 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ = (0g𝑇))
6867eqcomd 2742 1 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑇) = ⟨(0g𝑅), (0g𝑆)⟩)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1542  wcel 2114  wrex 3061  cop 4573   × cxp 5629  cfv 6498  (class class class)co 7367  Basecbs 17179  +gcplusg 17220  0gc0g 17402   ×s cxps 17470  Mndcmnd 18702
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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689  ax-cnex 11094  ax-resscn 11095  ax-1cn 11096  ax-icn 11097  ax-addcl 11098  ax-addrcl 11099  ax-mulcl 11100  ax-mulrcl 11101  ax-mulcom 11102  ax-addass 11103  ax-mulass 11104  ax-distr 11105  ax-i2m1 11106  ax-1ne0 11107  ax-1rid 11108  ax-rnegex 11109  ax-rrecex 11110  ax-cnre 11111  ax-pre-lttri 11112  ax-pre-lttrn 11113  ax-pre-ltadd 11114  ax-pre-mulgt0 11115
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-nel 3037  df-ral 3052  df-rex 3062  df-rmo 3342  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4851  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-pred 6265  df-ord 6326  df-on 6327  df-lim 6328  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-riota 7324  df-ov 7370  df-oprab 7371  df-mpo 7372  df-om 7818  df-1st 7942  df-2nd 7943  df-frecs 8231  df-wrecs 8262  df-recs 8311  df-rdg 8349  df-1o 8405  df-2o 8406  df-er 8643  df-map 8775  df-ixp 8846  df-en 8894  df-dom 8895  df-sdom 8896  df-fin 8897  df-sup 9355  df-inf 9356  df-pnf 11181  df-mnf 11182  df-xr 11183  df-ltxr 11184  df-le 11185  df-sub 11379  df-neg 11380  df-nn 12175  df-2 12244  df-3 12245  df-4 12246  df-5 12247  df-6 12248  df-7 12249  df-8 12250  df-9 12251  df-n0 12438  df-z 12525  df-dec 12645  df-uz 12789  df-fz 13462  df-struct 17117  df-slot 17152  df-ndx 17164  df-base 17180  df-plusg 17233  df-mulr 17234  df-sca 17236  df-vsca 17237  df-ip 17238  df-tset 17239  df-ple 17240  df-ds 17242  df-hom 17244  df-cco 17245  df-0g 17404  df-prds 17410  df-imas 17472  df-xps 17474  df-mgm 18608  df-sgrp 18687  df-mnd 18703
This theorem is referenced by:  xpsinv  19036  rngqiprngimf1  21298
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