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Theorem grpsubf 19230
Description: Functionality of group subtraction. (Contributed by Mario Carneiro, 9-Sep-2014.)
Hypotheses
Ref Expression
grpsubcl.b 𝐵 = (Base‘𝐺)
grpsubcl.m − = (-g‘𝐺)
Assertion
Ref Expression
grpsubf (𝐺 ∈ Grp → − :(𝐵 × 𝐵)⟶𝐵)

Proof of Theorem grpsubf
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 grpsubcl.b . . . . . . 7 𝐵 = (Base‘𝐺)
2 eqid 2761 . . . . . . 7 (invg‘𝐺) = (invg‘𝐺)
31, 2grpinvcl 19199 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑦 ∈ 𝐵) → ((invg‘𝐺)‘𝑦) ∈ 𝐵)
433adant2 1149 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → ((invg‘𝐺)‘𝑦) ∈ 𝐵)
5 eqid 2761 . . . . . 6 (+g‘𝐺) = (+g‘𝐺)
61, 5grpcl 19153 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑥 ∈ 𝐵 ∧ ((invg‘𝐺)‘𝑦) ∈ 𝐵) → (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)) ∈ 𝐵)
74, 6syld3an3 1436 . . . 4 ((𝐺 ∈ Grp ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)) ∈ 𝐵)
873expb 1138 . . 3 ((𝐺 ∈ Grp ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)) ∈ 𝐵)
98ralrimivva 3206 . 2 (𝐺 ∈ Grp → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)) ∈ 𝐵)
10 grpsubcl.m . . . 4 − = (-g‘𝐺)
111, 5, 2, 10grpsubfval 19195 . . 3 − = (𝑥 ∈ 𝐵, 𝑦 ∈ 𝐵 ↦ (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)))
1211fmpo 8080 . 2 (∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥(+g‘𝐺)((invg‘𝐺)‘𝑦)) ∈ 𝐵 ↔ − :(𝐵 × 𝐵)⟶𝐵)
139, 12sylib 221 1 (𝐺 ∈ Grp → − :(𝐵 × 𝐵)⟶𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2145  ∀wral 3077   × cxp 5649  ⟶wf 6535  ‘cfv 6539  (class class class)co 7421  Basecbs 17388  +gcplusg 17429  Grpcgrp 19145  invgcminusg 19146  -gcsg 19147
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7752
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3900  df-un 3902  df-in 3904  df-ss 3915  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6495  df-fun 6541  df-fn 6542  df-f 6543  df-fv 6547  df-riota 7378  df-ov 7424  df-oprab 7425  df-mpo 7426  df-1st 8002  df-2nd 8003  df-0g 17613  df-mgm 18817  df-sgrp 18909  df-mnd 18925  df-grp 19148  df-minusg 19149  df-sbg 19150
This theorem is used by:  grpsubcl  19231  cnfldsub  21707  distgp  24419  indistgp  24420  clssubg  24429  tgphaus  24437  qustgplem  24441  nrmmetd  24894  isngp2  24917  isngp3  24918  ngpds  24924  ngptgp  24956  tngnm  24971  tngngp2  24972  rrxds  25715
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