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Theorem grpinvval 19022
Description: The inverse of a group element. (Contributed by NM, 24-Aug-2011.) (Revised by Mario Carneiro, 7-Aug-2013.)
Hypotheses
Ref Expression
grpinvval.b 𝐵 = (Base‘𝐺)
grpinvval.p + = (+g𝐺)
grpinvval.o 0 = (0g𝐺)
grpinvval.n 𝑁 = (invg𝐺)
Assertion
Ref Expression
grpinvval (𝑋𝐵 → (𝑁𝑋) = (𝑦𝐵 (𝑦 + 𝑋) = 0 ))
Distinct variable groups:   𝑦,𝐵   𝑦,𝐺   𝑦,𝑋
Allowed substitution hints:   + (𝑦)   𝑁(𝑦)   0 (𝑦)

Proof of Theorem grpinvval
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 oveq2 7458 . . . 4 (𝑥 = 𝑋 → (𝑦 + 𝑥) = (𝑦 + 𝑋))
21eqeq1d 2742 . . 3 (𝑥 = 𝑋 → ((𝑦 + 𝑥) = 0 ↔ (𝑦 + 𝑋) = 0 ))
32riotabidv 7408 . 2 (𝑥 = 𝑋 → (𝑦𝐵 (𝑦 + 𝑥) = 0 ) = (𝑦𝐵 (𝑦 + 𝑋) = 0 ))
4 grpinvval.b . . 3 𝐵 = (Base‘𝐺)
5 grpinvval.p . . 3 + = (+g𝐺)
6 grpinvval.o . . 3 0 = (0g𝐺)
7 grpinvval.n . . 3 𝑁 = (invg𝐺)
84, 5, 6, 7grpinvfval 19020 . 2 𝑁 = (𝑥𝐵 ↦ (𝑦𝐵 (𝑦 + 𝑥) = 0 ))
9 riotaex 7410 . 2 (𝑦𝐵 (𝑦 + 𝑋) = 0 ) ∈ V
103, 8, 9fvmpt 7031 1 (𝑋𝐵 → (𝑁𝑋) = (𝑦𝐵 (𝑦 + 𝑋) = 0 ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1537  wcel 2108  cfv 6575  crio 7405  (class class class)co 7450  Basecbs 17260  +gcplusg 17313  0gc0g 17501  invgcminusg 18976
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7772
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-reu 3389  df-rab 3444  df-v 3490  df-sbc 3805  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-mpt 5250  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-iota 6527  df-fun 6577  df-fn 6578  df-f 6579  df-fv 6583  df-riota 7406  df-ov 7453  df-minusg 18979
This theorem is referenced by:  grplinv  19031  isgrpinv  19035  xrsinvgval  32993  ringinvval  33217  ressply1invg  33561  linvh  42055  primrootsunit1  42056
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