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Theorem xpsmnd0 18860
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 2765 . . 3 (Base‘𝑇) = (Base‘𝑇)
2 eqid 2765 . . 3 (0g𝑇) = (0g𝑇)
3 eqid 2765 . . 3 (+g𝑇) = (+g𝑇)
4 eqid 2765 . . . . . . 7 (Base‘𝑅) = (Base‘𝑅)
5 eqid 2765 . . . . . . 7 (0g𝑅) = (0g𝑅)
64, 5mndidcl 18829 . . . . . 6 (𝑅 ∈ Mnd → (0g𝑅) ∈ (Base‘𝑅))
76adantr 486 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑅) ∈ (Base‘𝑅))
8 eqid 2765 . . . . . . 7 (Base‘𝑆) = (Base‘𝑆)
9 eqid 2765 . . . . . . 7 (0g𝑆) = (0g𝑆)
108, 9mndidcl 18829 . . . . . 6 (𝑆 ∈ Mnd → (0g𝑆) ∈ (Base‘𝑆))
1110adantl 487 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑆) ∈ (Base‘𝑆))
127, 11opelxpd 5702 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ ∈ ((Base‘𝑅) × (Base‘𝑆)))
13 xpsmnd0.t . . . . 5 𝑇 = (𝑅 ×s 𝑆)
14 simpl 488 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → 𝑅 ∈ Mnd)
15 simpr 490 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → 𝑆 ∈ Mnd)
1613, 4, 8, 14, 15xpsbas 17644 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ((Base‘𝑅) × (Base‘𝑆)) = (Base‘𝑇))
1712, 16eleqtrd 2867 . . 3 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ ∈ (Base‘𝑇))
1816eleq2d 2851 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) ↔ 𝑥 ∈ (Base‘𝑇)))
19 elxp2 5687 . . . . . 6 (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) ↔ ∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩)
2014adantr 486 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑅 ∈ Mnd)
2115adantr 486 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑆 ∈ Mnd)
227adantr 486 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (0g𝑅) ∈ (Base‘𝑅))
2311adantr 486 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (0g𝑆) ∈ (Base‘𝑆))
24 simpl 488 . . . . . . . . . . 11 ((𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆)) → 𝑎 ∈ (Base‘𝑅))
2524adantl 487 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑎 ∈ (Base‘𝑅))
26 simpr 490 . . . . . . . . . . 11 ((𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆)) → 𝑏 ∈ (Base‘𝑆))
2726adantl 487 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → 𝑏 ∈ (Base‘𝑆))
28 eqid 2765 . . . . . . . . . . . 12 (+g𝑅) = (+g𝑅)
294, 28mndcl 18822 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ (0g𝑅) ∈ (Base‘𝑅) ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
3020, 22, 25, 29syl3anc 1398 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) ∈ (Base‘𝑅))
31 eqid 2765 . . . . . . . . . . . 12 (+g𝑆) = (+g𝑆)
328, 31mndcl 18822 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ (0g𝑆) ∈ (Base‘𝑆) ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) ∈ (Base‘𝑆))
3321, 23, 27, 32syl3anc 1398 . . . . . . . . . 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 17646 . . . . . . . . 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 18834 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
3614, 24, 35syl2an 608 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑅)(+g𝑅)𝑎) = 𝑎)
378, 31, 9mndlid 18834 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3815, 26, 37syl2an 608 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ((0g𝑆)(+g𝑆)𝑏) = 𝑏)
3936, 38opeq12d 4848 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨((0g𝑅)(+g𝑅)𝑎), ((0g𝑆)(+g𝑆)𝑏)⟩ = ⟨𝑎, 𝑏⟩)
4034, 39eqtrd 2800 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨𝑎, 𝑏⟩)
41 oveq2 7424 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩))
42 id 23 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → 𝑥 = ⟨𝑎, 𝑏⟩)
4341, 42eqeq12d 2781 . . . . . . . 8 (𝑥 = ⟨𝑎, 𝑏⟩ → ((⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥 ↔ (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)⟨𝑎, 𝑏⟩) = ⟨𝑎, 𝑏⟩))
4440, 43syl5ibrcom 250 . . . . . . 7 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4544rexlimdvva 3224 . . . . . 6 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩ → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4619, 45biimtrid 245 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4718, 46sylbird 263 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ (Base‘𝑇) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥))
4847imp 412 . . 3 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ 𝑥 ∈ (Base‘𝑇)) → (⟨(0g𝑅), (0g𝑆)⟩(+g𝑇)𝑥) = 𝑥)
494, 28mndcl 18822 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅) ∧ (0g𝑅) ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
5020, 25, 22, 49syl3anc 1398 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) ∈ (Base‘𝑅))
518, 31mndcl 18822 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆) ∧ (0g𝑆) ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) ∈ (Base‘𝑆))
5221, 27, 23, 51syl3anc 1398 . . . . . . . . . 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 17646 . . . . . . . . 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 18835 . . . . . . . . . . 11 ((𝑅 ∈ Mnd ∧ 𝑎 ∈ (Base‘𝑅)) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
5514, 24, 54syl2an 608 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑎(+g𝑅)(0g𝑅)) = 𝑎)
568, 31, 9mndrid 18835 . . . . . . . . . . 11 ((𝑆 ∈ Mnd ∧ 𝑏 ∈ (Base‘𝑆)) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5715, 26, 56syl2an 608 . . . . . . . . . 10 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑏(+g𝑆)(0g𝑆)) = 𝑏)
5855, 57opeq12d 4848 . . . . . . . . 9 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → ⟨(𝑎(+g𝑅)(0g𝑅)), (𝑏(+g𝑆)(0g𝑆))⟩ = ⟨𝑎, 𝑏⟩)
5953, 58eqtrd 2800 . . . . . . . 8 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨𝑎, 𝑏⟩)
60 oveq1 7423 . . . . . . . . 9 (𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩))
6160, 42eqeq12d 2781 . . . . . . . 8 (𝑥 = ⟨𝑎, 𝑏⟩ → ((𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥 ↔ (⟨𝑎, 𝑏⟩(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = ⟨𝑎, 𝑏⟩))
6259, 61syl5ibrcom 250 . . . . . . 7 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ (𝑎 ∈ (Base‘𝑅) ∧ 𝑏 ∈ (Base‘𝑆))) → (𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6362rexlimdvva 3224 . . . . . 6 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (∃𝑎 ∈ (Base‘𝑅)∃𝑏 ∈ (Base‘𝑆)𝑥 = ⟨𝑎, 𝑏⟩ → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6419, 63biimtrid 245 . . . . 5 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ ((Base‘𝑅) × (Base‘𝑆)) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6518, 64sylbird 263 . . . 4 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (𝑥 ∈ (Base‘𝑇) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥))
6665imp 412 . . 3 (((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) ∧ 𝑥 ∈ (Base‘𝑇)) → (𝑥(+g𝑇)⟨(0g𝑅), (0g𝑆)⟩) = 𝑥)
671, 2, 3, 17, 48, 66ismgmid2 18745 . 2 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → ⟨(0g𝑅), (0g𝑆)⟩ = (0g𝑇))
6867eqcomd 2771 1 ((𝑅 ∈ Mnd ∧ 𝑆 ∈ Mnd) → (0g𝑇) = ⟨(0g𝑅), (0g𝑆)⟩)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2146  wrex 3091  cop 4597   × cxp 5661  cfv 6540  (class class class)co 7416  Basecbs 17287  +gcplusg 17328  0gc0g 17510   ×s cxps 17578  Mndcmnd 18814
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-rep 5240  ax-sep 5259  ax-nul 5271  ax-pow 5338  ax-pr 5406  ax-un 7738  ax-cnex 11167  ax-resscn 11168  ax-1cn 11169  ax-icn 11170  ax-addcl 11171  ax-addrcl 11172  ax-mulcl 11173  ax-mulrcl 11174  ax-mulcom 11175  ax-addass 11176  ax-mulass 11177  ax-distr 11178  ax-i2m1 11179  ax-1ne0 11180  ax-1rid 11181  ax-rnegex 11182  ax-rrecex 11183  ax-cnre 11184  ax-pre-lttri 11185  ax-pre-lttrn 11186  ax-pre-ltadd 11187  ax-pre-mulgt0 11188
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-nel 3067  df-ral 3082  df-rex 3092  df-rmo 3371  df-reu 3372  df-rab 3419  df-v 3459  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-pss 3926  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-tp 4596  df-op 4598  df-uni 4875  df-iun 4960  df-br 5112  df-opab 5176  df-mpt 5195  df-tr 5221  df-id 5558  df-eprel 5563  df-po 5571  df-so 5572  df-fr 5616  df-we 5618  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-pred 6306  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-riota 7373  df-ov 7419  df-oprab 7420  df-mpo 7421  df-om 7865  df-1st 7988  df-2nd 7989  df-frecs 8280  df-wrecs 8311  df-recs 8360  df-rdg 8399  df-1o 8455  df-2o 8456  df-er 8696  df-map 8828  df-ixp 8898  df-en 8946  df-dom 8947  df-sdom 8948  df-fin 8949  df-sup 9405  df-inf 9406  df-pnf 11256  df-mnf 11257  df-xr 11258  df-ltxr 11259  df-le 11260  df-sub 11454  df-neg 11455  df-nn 12245  df-2 12314  df-3 12315  df-4 12316  df-5 12317  df-6 12318  df-7 12319  df-8 12320  df-9 12321  df-n0 12516  df-z 12603  df-dec 12724  df-uz 12875  df-fz 13548  df-struct 17225  df-slot 17260  df-ndx 17272  df-base 17288  df-plusg 17341  df-mulr 17342  df-sca 17344  df-vsca 17345  df-ip 17346  df-tset 17347  df-ple 17348  df-ds 17350  df-hom 17352  df-cco 17353  df-0g 17512  df-prds 17518  df-imas 17580  df-xps 17582  df-mgm 18716  df-sgrp 18799  df-mnd 18815
This theorem is used by:  xpsinv  19150  rngqiprngimf1  21470
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