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Theorem pclun2N 40269
Description: The projective subspace closure of the union of two subspaces equals their projective sum. (Contributed by NM, 12-Sep-2013.) (New usage is discouraged.)
Hypotheses
Ref Expression
pclun2.s 𝑆 = (PSubSp‘𝐾)
pclun2.p + = (+𝑃𝐾)
pclun2.c 𝑈 = (PCl‘𝐾)
Assertion
Ref Expression
pclun2N ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → (𝑈‘(𝑋𝑌)) = (𝑋 + 𝑌))

Proof of Theorem pclun2N
StepHypRef Expression
1 simp1 1137 . . 3 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → 𝐾 ∈ HL)
2 eqid 2737 . . . . 5 (Atoms‘𝐾) = (Atoms‘𝐾)
3 pclun2.s . . . . 5 𝑆 = (PSubSp‘𝐾)
42, 3psubssat 40124 . . . 4 ((𝐾 ∈ HL ∧ 𝑋𝑆) → 𝑋 ⊆ (Atoms‘𝐾))
543adant3 1133 . . 3 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → 𝑋 ⊆ (Atoms‘𝐾))
62, 3psubssat 40124 . . . 4 ((𝐾 ∈ HL ∧ 𝑌𝑆) → 𝑌 ⊆ (Atoms‘𝐾))
763adant2 1132 . . 3 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → 𝑌 ⊆ (Atoms‘𝐾))
8 pclun2.p . . . 4 + = (+𝑃𝐾)
9 pclun2.c . . . 4 𝑈 = (PCl‘𝐾)
102, 8, 9pclunN 40268 . . 3 ((𝐾 ∈ HL ∧ 𝑋 ⊆ (Atoms‘𝐾) ∧ 𝑌 ⊆ (Atoms‘𝐾)) → (𝑈‘(𝑋𝑌)) = (𝑈‘(𝑋 + 𝑌)))
111, 5, 7, 10syl3anc 1374 . 2 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → (𝑈‘(𝑋𝑌)) = (𝑈‘(𝑋 + 𝑌)))
123, 8paddclN 40212 . . 3 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → (𝑋 + 𝑌) ∈ 𝑆)
133, 9pclidN 40266 . . 3 ((𝐾 ∈ HL ∧ (𝑋 + 𝑌) ∈ 𝑆) → (𝑈‘(𝑋 + 𝑌)) = (𝑋 + 𝑌))
141, 12, 13syl2anc 585 . 2 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → (𝑈‘(𝑋 + 𝑌)) = (𝑋 + 𝑌))
1511, 14eqtrd 2772 1 ((𝐾 ∈ HL ∧ 𝑋𝑆𝑌𝑆) → (𝑈‘(𝑋𝑌)) = (𝑋 + 𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1087   = wceq 1542  wcel 2114  cun 3901  wss 3903  cfv 6500  (class class class)co 7368  Atomscatm 39633  HLchlt 39720  PSubSpcpsubsp 39866  +𝑃cpadd 40165  PClcpclN 40257
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5226  ax-sep 5243  ax-nul 5253  ax-pow 5312  ax-pr 5379  ax-un 7690
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rmo 3352  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-int 4905  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-riota 7325  df-ov 7371  df-oprab 7372  df-mpo 7373  df-1st 7943  df-2nd 7944  df-proset 18229  df-poset 18248  df-plt 18263  df-lub 18279  df-glb 18280  df-join 18281  df-meet 18282  df-p0 18358  df-lat 18367  df-clat 18434  df-oposet 39546  df-ol 39548  df-oml 39549  df-covers 39636  df-ats 39637  df-atl 39668  df-cvlat 39692  df-hlat 39721  df-psubsp 39873  df-padd 40166  df-pclN 40258
This theorem is referenced by: (None)
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