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Theorem shsumvalt 5279
Description: Value of subspace sum of two Hilbert space subspaces. Definition of subspace sum in [Kalmbach] p. 65.
Assertion
Ref Expression
shsumvalt |- ((A e. SH /\ B e. SH) -> (A +H B) = {x e. H~ | E.y e. A E.z e. B x = (y +v z)})
Distinct variable group(s):   x,y,z,A   x,B,y,z

Proof of Theorem shsumvalt
StepHypRef Expression
1 ax-hilex 4983 . . 3 |- H~ e. V
21rabex 1706 . 2 |- {x e. H~ | E.y e. A E.z e. B x = (y +v z)} e. V
3 rexeq 1325 . . 3 |- (w = A -> (E.y e. w E.z e. v x = (y +v z) <-> E.y e. A E.z e. v x = (y +v z)))
43birabsdv 1344 . 2 |- (w = A -> {x e. H~ | E.y e. w E.z e. v x = (y +v z)} = {x e. H~ | E.y e. A E.z e. v x = (y +v z)})
5 rexeq 1325 . . . 4 |- (v = B -> (E.z e. v x = (y +v z) <-> E.z e. B x = (y +v z)))
65birexdv 1220 . . 3 |- (v = B -> (E.y e. A E.z e. v x = (y +v z) <-> E.y e. A E.z e. B x = (y +v z)))
76birabsdv 1344 . 2 |- (v = B -> {x e. H~ | E.y e. A E.z e. v x = (y +v z)} = {x e. H~ | E.y e. A E.z e. B x = (y +v z)})
8 df-shsum 5275 . 2 |- +H = {<.<.w, v>., u>. | ((w e. SH /\ v e. SH) /\ u = {x e. H~ | E.y e. w E.z e. v x = (y +v z)})}
92, 4, 7, 8oprabval2 3051 1 |- ((A e. SH /\ B e. SH) -> (A +H B) = {x e. H~ | E.y e. A E.z e. B x = (y +v z)})
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196   = wceq 1091   e. wcel 1092  E.wrex 1202  {crab 1204  (class class class)co 3001  H~chil 4958   +v cva 4959  SHcsh 4967   +H cph 4970
This theorem is referenced by:  shselt 5280  shscl 5282
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077  ax-hilex 4983
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-rex 1206  df-rab 1208  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-br 2063  df-opab 2098  df-id 2125  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fv 2438  df-opr 3003  df-oprab 3004  df-shsum 5275
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