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Theorem lsmelvalix 19674
Description: Subspace sum membership (for a group or vector space). (Contributed by NM, 4-Feb-2014.) (Revised by Mario Carneiro, 19-Apr-2016.)
Hypotheses
Ref Expression
lsmfval.v 𝐵 = (Base‘𝐺)
lsmfval.a + = (+g𝐺)
lsmfval.s = (LSSum‘𝐺)
Assertion
Ref Expression
lsmelvalix (((𝐺𝑉𝑇𝐵𝑈𝐵) ∧ (𝑋𝑇𝑌𝑈)) → (𝑋 + 𝑌) ∈ (𝑇 𝑈))

Proof of Theorem lsmelvalix
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2735 . . 3 (𝑋 + 𝑌) = (𝑋 + 𝑌)
2 rspceov 7480 . . 3 ((𝑋𝑇𝑌𝑈 ∧ (𝑋 + 𝑌) = (𝑋 + 𝑌)) → ∃𝑥𝑇𝑦𝑈 (𝑋 + 𝑌) = (𝑥 + 𝑦))
31, 2mp3an3 1449 . 2 ((𝑋𝑇𝑌𝑈) → ∃𝑥𝑇𝑦𝑈 (𝑋 + 𝑌) = (𝑥 + 𝑦))
4 lsmfval.v . . . 4 𝐵 = (Base‘𝐺)
5 lsmfval.a . . . 4 + = (+g𝐺)
6 lsmfval.s . . . 4 = (LSSum‘𝐺)
74, 5, 6lsmelvalx 19673 . . 3 ((𝐺𝑉𝑇𝐵𝑈𝐵) → ((𝑋 + 𝑌) ∈ (𝑇 𝑈) ↔ ∃𝑥𝑇𝑦𝑈 (𝑋 + 𝑌) = (𝑥 + 𝑦)))
87biimpar 477 . 2 (((𝐺𝑉𝑇𝐵𝑈𝐵) ∧ ∃𝑥𝑇𝑦𝑈 (𝑋 + 𝑌) = (𝑥 + 𝑦)) → (𝑋 + 𝑌) ∈ (𝑇 𝑈))
93, 8sylan2 593 1 (((𝐺𝑉𝑇𝐵𝑈𝐵) ∧ (𝑋𝑇𝑌𝑈)) → (𝑋 + 𝑌) ∈ (𝑇 𝑈))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  w3a 1086   = wceq 1537  wcel 2106  wrex 3068  wss 3963  cfv 6563  (class class class)co 7431  Basecbs 17245  +gcplusg 17298  LSSumclsm 19667
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-rep 5285  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-reu 3379  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5583  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571  df-ov 7434  df-oprab 7435  df-mpo 7436  df-1st 8013  df-2nd 8014  df-lsm 19669
This theorem is referenced by:  lsmub1x  19679  lsmub2x  19680  lsmelvali  19683  lsmsubm  19686  kercvrlsm  43072
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