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Theorem cntri 18937
Description: Defining property of the center of a group. (Contributed by Mario Carneiro, 22-Sep-2015.)
Hypotheses
Ref Expression
cntri.b 𝐵 = (Base‘𝑀)
cntri.p + = (+g𝑀)
cntri.z 𝑍 = (Cntr‘𝑀)
Assertion
Ref Expression
cntri ((𝑋𝑍𝑌𝐵) → (𝑋 + 𝑌) = (𝑌 + 𝑋))

Proof of Theorem cntri
StepHypRef Expression
1 cntri.z . . . 4 𝑍 = (Cntr‘𝑀)
2 cntri.b . . . . 5 𝐵 = (Base‘𝑀)
3 eqid 2738 . . . . 5 (Cntz‘𝑀) = (Cntz‘𝑀)
42, 3cntrval 18925 . . . 4 ((Cntz‘𝑀)‘𝐵) = (Cntr‘𝑀)
51, 4eqtr4i 2769 . . 3 𝑍 = ((Cntz‘𝑀)‘𝐵)
65eleq2i 2830 . 2 (𝑋𝑍𝑋 ∈ ((Cntz‘𝑀)‘𝐵))
7 cntri.p . . 3 + = (+g𝑀)
87, 3cntzi 18935 . 2 ((𝑋 ∈ ((Cntz‘𝑀)‘𝐵) ∧ 𝑌𝐵) → (𝑋 + 𝑌) = (𝑌 + 𝑋))
96, 8sylanb 581 1 ((𝑋𝑍𝑌𝐵) → (𝑋 + 𝑌) = (𝑌 + 𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396   = wceq 1539  wcel 2106  cfv 6433  (class class class)co 7275  Basecbs 16912  +gcplusg 16962  Cntzccntz 18921  Cntrccntr 18922
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-ov 7278  df-cntz 18923  df-cntr 18924
This theorem is referenced by:  cntrcmnd  19443  primefld  20073
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