Theorem osumclN 40089

Description: Closure of orthogonal sum. If 𝑋 and 𝑌 are orthogonal closed projective subspaces, then their sum is closed. (Contributed by NM, 25-Mar-2012.) (New usage is discouraged.)

Hypotheses

Ref	Expression
osumcl.p	⊢ + = (+𝑃‘𝐾)
osumcl.o	⊢ ⊥ = (⊥𝑃‘𝐾)
osumcl.c	⊢ 𝐶 = (PSubCl‘𝐾)

Assertion

Ref	Expression
osumclN	⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → (𝑋 + 𝑌) ∈ 𝐶)

Proof of Theorem osumclN

Step	Hyp	Ref	Expression
1		simpl1 1192	. . 3 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → 𝐾 ∈ HL)
2		simpl2 1193	. . . 4 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → 𝑋 ∈ 𝐶)
3		eqid 2733	. . . . 5 ⊢ (Atoms‘𝐾) = (Atoms‘𝐾)
4		osumcl.c	. . . . 5 ⊢ 𝐶 = (PSubCl‘𝐾)
5	3, 4	psubclssatN 40063	. . . 4 ⊢ ((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ (Atoms‘𝐾))
6	1, 2, 5	syl2anc 584	. . 3 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → 𝑋 ⊆ (Atoms‘𝐾))
7		simpl3 1194	. . . 4 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → 𝑌 ∈ 𝐶)
8	3, 4	psubclssatN 40063	. . . 4 ⊢ ((𝐾 ∈ HL ∧ 𝑌 ∈ 𝐶) → 𝑌 ⊆ (Atoms‘𝐾))
9	1, 7, 8	syl2anc 584	. . 3 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → 𝑌 ⊆ (Atoms‘𝐾))
10		osumcl.p	. . . 4 ⊢ + = (+𝑃‘𝐾)
11	3, 10	paddssat 39936	. . 3 ⊢ ((𝐾 ∈ HL ∧ 𝑋 ⊆ (Atoms‘𝐾) ∧ 𝑌 ⊆ (Atoms‘𝐾)) → (𝑋 + 𝑌) ⊆ (Atoms‘𝐾))
12	1, 6, 9, 11	syl3anc 1373	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → (𝑋 + 𝑌) ⊆ (Atoms‘𝐾))
13		simpll1 1213	. . . 4 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 = ∅) → 𝐾 ∈ HL)
14		oveq1 7361	. . . . . 6 ⊢ (𝑋 = ∅ → (𝑋 + 𝑌) = (∅ + 𝑌))
15	3, 10	padd02 39934	. . . . . . 7 ⊢ ((𝐾 ∈ HL ∧ 𝑌 ⊆ (Atoms‘𝐾)) → (∅ + 𝑌) = 𝑌)
16	1, 9, 15	syl2anc 584	. . . . . 6 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → (∅ + 𝑌) = 𝑌)
17	14, 16	sylan9eqr 2790	. . . . 5 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 = ∅) → (𝑋 + 𝑌) = 𝑌)
18		simpll3 1215	. . . . 5 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 = ∅) → 𝑌 ∈ 𝐶)
19	17, 18	eqeltrd 2833	. . . 4 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 = ∅) → (𝑋 + 𝑌) ∈ 𝐶)
20		osumcl.o	. . . . 5 ⊢ ⊥ = (⊥𝑃‘𝐾)
21	20, 4	psubcli2N 40061	. . . 4 ⊢ ((𝐾 ∈ HL ∧ (𝑋 + 𝑌) ∈ 𝐶) → ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))
22	13, 19, 21	syl2anc 584	. . 3 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 = ∅) → ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))
23	10, 20, 4	osumcllem11N 40088	. . . . 5 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ (𝑋 ⊆ ( ⊥ ‘𝑌) ∧ 𝑋 ≠ ∅)) → (𝑋 + 𝑌) = ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))))
24	23	anassrs 467	. . . 4 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 ≠ ∅) → (𝑋 + 𝑌) = ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))))
25	24	eqcomd 2739	. . 3 ⊢ ((((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) ∧ 𝑋 ≠ ∅) → ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))
26	22, 25	pm2.61dane 3016	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))
27	3, 20, 4	ispsubclN 40059	. . 3 ⊢ (𝐾 ∈ HL → ((𝑋 + 𝑌) ∈ 𝐶 ↔ ((𝑋 + 𝑌) ⊆ (Atoms‘𝐾) ∧ ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))))
28	1, 27	syl 17	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → ((𝑋 + 𝑌) ∈ 𝐶 ↔ ((𝑋 + 𝑌) ⊆ (Atoms‘𝐾) ∧ ( ⊥ ‘( ⊥ ‘(𝑋 + 𝑌))) = (𝑋 + 𝑌))))
29	12, 26, 28	mpbir2and 713	1 ⊢ (((𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶) ∧ 𝑋 ⊆ ( ⊥ ‘𝑌)) → (𝑋 + 𝑌) ∈ 𝐶)

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∧ w3a 1086   = wceq 1541   ∈ wcel 2113   ≠ wne 2929   ⊆ wss 3898  ∅c0 4282  ‘cfv 6488  (class class class)co 7354  Atomscatm 39385  HLchlt 39472  +_𝑃cpadd 39917  ⊥_𝑃cpolN 40024  PSubClcpscN 40056

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2705  ax-rep 5221  ax-sep 5238  ax-nul 5248  ax-pow 5307  ax-pr 5374  ax-un 7676

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-nfc 2882  df-ne 2930  df-ral 3049  df-rex 3058  df-rmo 3347  df-reu 3348  df-rab 3397  df-v 3439  df-sbc 3738  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3918  df-nul 4283  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4861  df-iun 4945  df-iin 4946  df-br 5096  df-opab 5158  df-mpt 5177  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-res 5633  df-ima 5634  df-iota 6444  df-fun 6490  df-fn 6491  df-f 6492  df-f1 6493  df-fo 6494  df-f1o 6495  df-fv 6496  df-riota 7311  df-ov 7357  df-oprab 7358  df-mpo 7359  df-1st 7929  df-2nd 7930  df-proset 18204  df-poset 18223  df-plt 18238  df-lub 18254  df-glb 18255  df-join 18256  df-meet 18257  df-p0 18333  df-p1 18334  df-lat 18342  df-clat 18409  df-oposet 39298  df-ol 39300  df-oml 39301  df-covers 39388  df-ats 39389  df-atl 39420  df-cvlat 39444  df-hlat 39473  df-psubsp 39625  df-pmap 39626  df-padd 39918  df-polarityN 40025  df-psubclN 40057

This theorem is referenced by:  pmapojoinN  40090  pexmidN  40091