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Theorem cntri 18852
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 18840 . . . 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 18850 . 2 ((𝑋 ∈ ((Cntz‘𝑀)‘𝐵) ∧ 𝑌𝐵) → (𝑋 + 𝑌) = (𝑌 + 𝑋))
96, 8sylanb 580 1 ((𝑋𝑍𝑌𝐵) → (𝑋 + 𝑌) = (𝑌 + 𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1539  wcel 2108  cfv 6418  (class class class)co 7255  Basecbs 16840  +gcplusg 16888  Cntzccntz 18836  Cntrccntr 18837
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-ov 7258  df-cntz 18838  df-cntr 18839
This theorem is referenced by:  cntrcmnd  19358  primefld  19988
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