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Theorem grpnpncan0 18459
Description: Cancellation law for group subtraction (npncan2 11105 analog). (Contributed by AV, 24-Nov-2019.)
Hypotheses
Ref Expression
grpsubadd.b 𝐵 = (Base‘𝐺)
grpsubadd.p + = (+g𝐺)
grpsubadd.m = (-g𝐺)
grpnpncan0.0 0 = (0g𝐺)
Assertion
Ref Expression
grpnpncan0 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → ((𝑋 𝑌) + (𝑌 𝑋)) = 0 )

Proof of Theorem grpnpncan0
StepHypRef Expression
1 simpl 486 . . 3 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → 𝐺 ∈ Grp)
2 simprl 771 . . 3 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → 𝑋𝐵)
3 simprr 773 . . 3 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → 𝑌𝐵)
4 grpsubadd.b . . . 4 𝐵 = (Base‘𝐺)
5 grpsubadd.p . . . 4 + = (+g𝐺)
6 grpsubadd.m . . . 4 = (-g𝐺)
74, 5, 6grpnpncan 18458 . . 3 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵𝑋𝐵)) → ((𝑋 𝑌) + (𝑌 𝑋)) = (𝑋 𝑋))
81, 2, 3, 2, 7syl13anc 1374 . 2 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → ((𝑋 𝑌) + (𝑌 𝑋)) = (𝑋 𝑋))
9 grpnpncan0.0 . . . 4 0 = (0g𝐺)
104, 9, 6grpsubid 18447 . . 3 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑋 𝑋) = 0 )
1110adantrr 717 . 2 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → (𝑋 𝑋) = 0 )
128, 11eqtrd 2777 1 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → ((𝑋 𝑌) + (𝑌 𝑋)) = 0 )
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1543  wcel 2110  cfv 6380  (class class class)co 7213  Basecbs 16760  +gcplusg 16802  0gc0g 16944  Grpcgrp 18365  -gcsg 18367
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-sep 5192  ax-nul 5199  ax-pow 5258  ax-pr 5322  ax-un 7523
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2886  df-ne 2941  df-ral 3066  df-rex 3067  df-reu 3068  df-rmo 3069  df-rab 3070  df-v 3410  df-sbc 3695  df-csb 3812  df-dif 3869  df-un 3871  df-in 3873  df-ss 3883  df-nul 4238  df-if 4440  df-pw 4515  df-sn 4542  df-pr 4544  df-op 4548  df-uni 4820  df-iun 4906  df-br 5054  df-opab 5116  df-mpt 5136  df-id 5455  df-xp 5557  df-rel 5558  df-cnv 5559  df-co 5560  df-dm 5561  df-rn 5562  df-res 5563  df-ima 5564  df-iota 6338  df-fun 6382  df-fn 6383  df-f 6384  df-fv 6388  df-riota 7170  df-ov 7216  df-oprab 7217  df-mpo 7218  df-1st 7761  df-2nd 7762  df-0g 16946  df-mgm 18114  df-sgrp 18163  df-mnd 18174  df-grp 18368  df-minusg 18369  df-sbg 18370
This theorem is referenced by:  cayhamlem1  21763
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