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Theorem isabl 13938
Description: The predicate "is an Abelian (commutative) group". (Contributed by NM, 17-Oct-2011.)
Assertion
Ref Expression
isabl (𝐺 ∈ Abel ↔ (𝐺 ∈ Grp ∧ 𝐺 ∈ CMnd))

Proof of Theorem isabl
StepHypRef Expression
1 df-abl 13937 . 2 Abel = (Grp ∩ CMnd)
21elin2 3397 1 (𝐺 ∈ Abel ↔ (𝐺 ∈ Grp ∧ 𝐺 ∈ CMnd))
Colors of variables: wff set class
Syntax hints:  wa 104  wb 105  wcel 2202  Grpcgrp 13646  CMndccmn 13934  Abelcabl 13935
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-in 3207  df-abl 13937
This theorem is referenced by:  ablgrp  13939  ablcmn  13941  isabl2  13944  ablpropd  13946  isabld  13949  ghmabl  13978  unitabl  14195
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