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Theorem grpoinvf 27912
Description: Mapping of the inverse function of a group. (Contributed by NM, 29-Mar-2008.) (Revised by Mario Carneiro, 15-Dec-2013.) (New usage is discouraged.)
Hypotheses
Ref Expression
grpasscan1.1 𝑋 = ran 𝐺
grpasscan1.2 𝑁 = (inv‘𝐺)
Assertion
Ref Expression
grpoinvf (𝐺 ∈ GrpOp → 𝑁:𝑋1-1-onto𝑋)

Proof of Theorem grpoinvf
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 riotaex 6843 . . . 4 (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺)) ∈ V
2 eqid 2799 . . . 4 (𝑥𝑋 ↦ (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺))) = (𝑥𝑋 ↦ (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺)))
31, 2fnmpti 6233 . . 3 (𝑥𝑋 ↦ (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺))) Fn 𝑋
4 grpasscan1.1 . . . . 5 𝑋 = ran 𝐺
5 eqid 2799 . . . . 5 (GId‘𝐺) = (GId‘𝐺)
6 grpasscan1.2 . . . . 5 𝑁 = (inv‘𝐺)
74, 5, 6grpoinvfval 27902 . . . 4 (𝐺 ∈ GrpOp → 𝑁 = (𝑥𝑋 ↦ (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺))))
87fneq1d 6192 . . 3 (𝐺 ∈ GrpOp → (𝑁 Fn 𝑋 ↔ (𝑥𝑋 ↦ (𝑦𝑋 (𝑦𝐺𝑥) = (GId‘𝐺))) Fn 𝑋))
93, 8mpbiri 250 . 2 (𝐺 ∈ GrpOp → 𝑁 Fn 𝑋)
10 fnrnfv 6467 . . . 4 (𝑁 Fn 𝑋 → ran 𝑁 = {𝑦 ∣ ∃𝑥𝑋 𝑦 = (𝑁𝑥)})
119, 10syl 17 . . 3 (𝐺 ∈ GrpOp → ran 𝑁 = {𝑦 ∣ ∃𝑥𝑋 𝑦 = (𝑁𝑥)})
124, 6grpoinvcl 27904 . . . . . . 7 ((𝐺 ∈ GrpOp ∧ 𝑦𝑋) → (𝑁𝑦) ∈ 𝑋)
134, 6grpo2inv 27911 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝑦𝑋) → (𝑁‘(𝑁𝑦)) = 𝑦)
1413eqcomd 2805 . . . . . . 7 ((𝐺 ∈ GrpOp ∧ 𝑦𝑋) → 𝑦 = (𝑁‘(𝑁𝑦)))
15 fveq2 6411 . . . . . . . 8 (𝑥 = (𝑁𝑦) → (𝑁𝑥) = (𝑁‘(𝑁𝑦)))
1615rspceeqv 3515 . . . . . . 7 (((𝑁𝑦) ∈ 𝑋𝑦 = (𝑁‘(𝑁𝑦))) → ∃𝑥𝑋 𝑦 = (𝑁𝑥))
1712, 14, 16syl2anc 580 . . . . . 6 ((𝐺 ∈ GrpOp ∧ 𝑦𝑋) → ∃𝑥𝑋 𝑦 = (𝑁𝑥))
1817ex 402 . . . . 5 (𝐺 ∈ GrpOp → (𝑦𝑋 → ∃𝑥𝑋 𝑦 = (𝑁𝑥)))
19 simpr 478 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝑥𝑋) ∧ 𝑦 = (𝑁𝑥)) → 𝑦 = (𝑁𝑥))
204, 6grpoinvcl 27904 . . . . . . . . 9 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋) → (𝑁𝑥) ∈ 𝑋)
2120adantr 473 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝑥𝑋) ∧ 𝑦 = (𝑁𝑥)) → (𝑁𝑥) ∈ 𝑋)
2219, 21eqeltrd 2878 . . . . . . 7 (((𝐺 ∈ GrpOp ∧ 𝑥𝑋) ∧ 𝑦 = (𝑁𝑥)) → 𝑦𝑋)
2322exp31 411 . . . . . 6 (𝐺 ∈ GrpOp → (𝑥𝑋 → (𝑦 = (𝑁𝑥) → 𝑦𝑋)))
2423rexlimdv 3211 . . . . 5 (𝐺 ∈ GrpOp → (∃𝑥𝑋 𝑦 = (𝑁𝑥) → 𝑦𝑋))
2518, 24impbid 204 . . . 4 (𝐺 ∈ GrpOp → (𝑦𝑋 ↔ ∃𝑥𝑋 𝑦 = (𝑁𝑥)))
2625abbi2dv 2919 . . 3 (𝐺 ∈ GrpOp → 𝑋 = {𝑦 ∣ ∃𝑥𝑋 𝑦 = (𝑁𝑥)})
2711, 26eqtr4d 2836 . 2 (𝐺 ∈ GrpOp → ran 𝑁 = 𝑋)
28 fveq2 6411 . . . 4 ((𝑁𝑥) = (𝑁𝑦) → (𝑁‘(𝑁𝑥)) = (𝑁‘(𝑁𝑦)))
294, 6grpo2inv 27911 . . . . . 6 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋) → (𝑁‘(𝑁𝑥)) = 𝑥)
3029, 13eqeqan12d 2815 . . . . 5 (((𝐺 ∈ GrpOp ∧ 𝑥𝑋) ∧ (𝐺 ∈ GrpOp ∧ 𝑦𝑋)) → ((𝑁‘(𝑁𝑥)) = (𝑁‘(𝑁𝑦)) ↔ 𝑥 = 𝑦))
3130anandis 669 . . . 4 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → ((𝑁‘(𝑁𝑥)) = (𝑁‘(𝑁𝑦)) ↔ 𝑥 = 𝑦))
3228, 31syl5ib 236 . . 3 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → ((𝑁𝑥) = (𝑁𝑦) → 𝑥 = 𝑦))
3332ralrimivva 3152 . 2 (𝐺 ∈ GrpOp → ∀𝑥𝑋𝑦𝑋 ((𝑁𝑥) = (𝑁𝑦) → 𝑥 = 𝑦))
34 dff1o6 6759 . 2 (𝑁:𝑋1-1-onto𝑋 ↔ (𝑁 Fn 𝑋 ∧ ran 𝑁 = 𝑋 ∧ ∀𝑥𝑋𝑦𝑋 ((𝑁𝑥) = (𝑁𝑦) → 𝑥 = 𝑦)))
359, 27, 33, 34syl3anbrc 1444 1 (𝐺 ∈ GrpOp → 𝑁:𝑋1-1-onto𝑋)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198  wa 385   = wceq 1653  wcel 2157  {cab 2785  wral 3089  wrex 3090  cmpt 4922  ran crn 5313   Fn wfn 6096  1-1-ontowf1o 6100  cfv 6101  crio 6838  (class class class)co 6878  GrpOpcgr 27869  GIdcgi 27870  invcgn 27871
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pr 5097  ax-un 7183
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-ral 3094  df-rex 3095  df-reu 3096  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-iun 4712  df-br 4844  df-opab 4906  df-mpt 4923  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-riota 6839  df-ov 6881  df-grpo 27873  df-gid 27874  df-ginv 27875
This theorem is referenced by:  nvinvfval  28020
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