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Theorem grpinv11 17400
Description: The group inverse is one-to-one. (Contributed by NM, 22-Mar-2015.)
Hypotheses
Ref Expression
grpinvinv.b 𝐵 = (Base‘𝐺)
grpinvinv.n 𝑁 = (invg𝐺)
grpinv11.g (𝜑𝐺 ∈ Grp)
grpinv11.x (𝜑𝑋𝐵)
grpinv11.y (𝜑𝑌𝐵)
Assertion
Ref Expression
grpinv11 (𝜑 → ((𝑁𝑋) = (𝑁𝑌) ↔ 𝑋 = 𝑌))

Proof of Theorem grpinv11
StepHypRef Expression
1 fveq2 6150 . . . . 5 ((𝑁𝑋) = (𝑁𝑌) → (𝑁‘(𝑁𝑋)) = (𝑁‘(𝑁𝑌)))
21adantl 482 . . . 4 ((𝜑 ∧ (𝑁𝑋) = (𝑁𝑌)) → (𝑁‘(𝑁𝑋)) = (𝑁‘(𝑁𝑌)))
3 grpinv11.g . . . . . 6 (𝜑𝐺 ∈ Grp)
4 grpinv11.x . . . . . 6 (𝜑𝑋𝐵)
5 grpinvinv.b . . . . . . 7 𝐵 = (Base‘𝐺)
6 grpinvinv.n . . . . . . 7 𝑁 = (invg𝐺)
75, 6grpinvinv 17398 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑁‘(𝑁𝑋)) = 𝑋)
83, 4, 7syl2anc 692 . . . . 5 (𝜑 → (𝑁‘(𝑁𝑋)) = 𝑋)
98adantr 481 . . . 4 ((𝜑 ∧ (𝑁𝑋) = (𝑁𝑌)) → (𝑁‘(𝑁𝑋)) = 𝑋)
10 grpinv11.y . . . . . 6 (𝜑𝑌𝐵)
115, 6grpinvinv 17398 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑌𝐵) → (𝑁‘(𝑁𝑌)) = 𝑌)
123, 10, 11syl2anc 692 . . . . 5 (𝜑 → (𝑁‘(𝑁𝑌)) = 𝑌)
1312adantr 481 . . . 4 ((𝜑 ∧ (𝑁𝑋) = (𝑁𝑌)) → (𝑁‘(𝑁𝑌)) = 𝑌)
142, 9, 133eqtr3d 2668 . . 3 ((𝜑 ∧ (𝑁𝑋) = (𝑁𝑌)) → 𝑋 = 𝑌)
1514ex 450 . 2 (𝜑 → ((𝑁𝑋) = (𝑁𝑌) → 𝑋 = 𝑌))
16 fveq2 6150 . 2 (𝑋 = 𝑌 → (𝑁𝑋) = (𝑁𝑌))
1715, 16impbid1 215 1 (𝜑 → ((𝑁𝑋) = (𝑁𝑌) ↔ 𝑋 = 𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384   = wceq 1480  wcel 1992  cfv 5850  Basecbs 15776  Grpcgrp 17338  invgcminusg 17339
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-rep 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3193  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3897  df-if 4064  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-f1 5855  df-fo 5856  df-f1o 5857  df-fv 5858  df-riota 6566  df-ov 6608  df-0g 16018  df-mgm 17158  df-sgrp 17200  df-mnd 17211  df-grp 17341  df-minusg 17342
This theorem is referenced by:  gexdvds  17915  dchrisum0re  25097  mapdpglem30  36438
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