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Theorem iscmn 18836
 Description: The predicate "is a commutative monoid." (Contributed by Mario Carneiro, 6-Jan-2015.)
Hypotheses
Ref Expression
iscmn.b 𝐵 = (Base‘𝐺)
iscmn.p + = (+g𝐺)
Assertion
Ref Expression
iscmn (𝐺 ∈ CMnd ↔ (𝐺 ∈ Mnd ∧ ∀𝑥𝐵𝑦𝐵 (𝑥 + 𝑦) = (𝑦 + 𝑥)))
Distinct variable groups:   𝑥,𝑦,𝐵   𝑥,𝐺,𝑦
Allowed substitution hints:   + (𝑥,𝑦)

Proof of Theorem iscmn
Dummy variable 𝑔 is distinct from all other variables.
StepHypRef Expression
1 fveq2 6666 . . . . 5 (𝑔 = 𝐺 → (Base‘𝑔) = (Base‘𝐺))
2 iscmn.b . . . . 5 𝐵 = (Base‘𝐺)
31, 2syl6eqr 2878 . . . 4 (𝑔 = 𝐺 → (Base‘𝑔) = 𝐵)
4 raleq 3410 . . . . 5 ((Base‘𝑔) = 𝐵 → (∀𝑦 ∈ (Base‘𝑔)(𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ ∀𝑦𝐵 (𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥)))
54raleqbi1dv 3408 . . . 4 ((Base‘𝑔) = 𝐵 → (∀𝑥 ∈ (Base‘𝑔)∀𝑦 ∈ (Base‘𝑔)(𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ ∀𝑥𝐵𝑦𝐵 (𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥)))
63, 5syl 17 . . 3 (𝑔 = 𝐺 → (∀𝑥 ∈ (Base‘𝑔)∀𝑦 ∈ (Base‘𝑔)(𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ ∀𝑥𝐵𝑦𝐵 (𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥)))
7 fveq2 6666 . . . . . . 7 (𝑔 = 𝐺 → (+g𝑔) = (+g𝐺))
8 iscmn.p . . . . . . 7 + = (+g𝐺)
97, 8syl6eqr 2878 . . . . . 6 (𝑔 = 𝐺 → (+g𝑔) = + )
109oveqd 7168 . . . . 5 (𝑔 = 𝐺 → (𝑥(+g𝑔)𝑦) = (𝑥 + 𝑦))
119oveqd 7168 . . . . 5 (𝑔 = 𝐺 → (𝑦(+g𝑔)𝑥) = (𝑦 + 𝑥))
1210, 11eqeq12d 2840 . . . 4 (𝑔 = 𝐺 → ((𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ (𝑥 + 𝑦) = (𝑦 + 𝑥)))
13122ralbidv 3203 . . 3 (𝑔 = 𝐺 → (∀𝑥𝐵𝑦𝐵 (𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ ∀𝑥𝐵𝑦𝐵 (𝑥 + 𝑦) = (𝑦 + 𝑥)))
146, 13bitrd 280 . 2 (𝑔 = 𝐺 → (∀𝑥 ∈ (Base‘𝑔)∀𝑦 ∈ (Base‘𝑔)(𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥) ↔ ∀𝑥𝐵𝑦𝐵 (𝑥 + 𝑦) = (𝑦 + 𝑥)))
15 df-cmn 18830 . 2 CMnd = {𝑔 ∈ Mnd ∣ ∀𝑥 ∈ (Base‘𝑔)∀𝑦 ∈ (Base‘𝑔)(𝑥(+g𝑔)𝑦) = (𝑦(+g𝑔)𝑥)}
1614, 15elrab2 3686 1 (𝐺 ∈ CMnd ↔ (𝐺 ∈ Mnd ∧ ∀𝑥𝐵𝑦𝐵 (𝑥 + 𝑦) = (𝑦 + 𝑥)))
 Colors of variables: wff setvar class Syntax hints:   ↔ wb 207   ∧ wa 396   = wceq 1530   ∈ wcel 2106  ∀wral 3142  ‘cfv 6351  (class class class)co 7151  Basecbs 16475  +gcplusg 16557  Mndcmnd 17902  CMndccmn 18828 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2152  ax-12 2167  ax-ext 2796 This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-clab 2803  df-cleq 2817  df-clel 2897  df-nfc 2967  df-ral 3147  df-rex 3148  df-rab 3151  df-v 3501  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4470  df-sn 4564  df-pr 4566  df-op 4570  df-uni 4837  df-br 5063  df-iota 6311  df-fv 6359  df-ov 7154  df-cmn 18830 This theorem is referenced by:  isabl2  18837  cmnpropd  18838  iscmnd  18841  cmnmnd  18844  cmncom  18845  ghmcmn  18874  submcmn2  18881  cycsubmcmn  18930  iscrng2  19235  xrs1cmn  20501  abliso  30598  gicabl  39561  pgrpgt2nabl  44243
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