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Theorem shsidm 5358
Description: Idempotent law for Hilbert subspace sum.
Hypothesis
Ref Expression
shsidm.1 |- A e. SH
Assertion
Ref Expression
shsidm |- (A +H A) = A

Proof of Theorem shsidm
StepHypRef Expression
1 shsidm.1 . . . . 5 |- A e. SH
21, 1shsel 5281 . . . 4 |- (x e. (A +H A) <-> E.y e. A E.z e. A x = (y +v z))
3 eleq1 1149 . . . . . . 7 |- (x = (y +v z) -> (x e. A <-> (y +v z) e. A))
4 shaddclt 5123 . . . . . . . 8 |- (A e. SH -> ((y e. A /\ z e. A) -> (y +v z) e. A))
51, 4ax-mp 6 . . . . . . 7 |- ((y e. A /\ z e. A) -> (y +v z) e. A)
63, 5syl5bir 184 . . . . . 6 |- (x = (y +v z) -> ((y e. A /\ z e. A) -> x e. A))
76com12 13 . . . . 5 |- ((y e. A /\ z e. A) -> (x = (y +v z) -> x e. A))
87r19.23aivv 1287 . . . 4 |- (E.y e. A E.z e. A x = (y +v z) -> x e. A)
92, 8sylbi 174 . . 3 |- (x e. (A +H A) -> x e. A)
109ssriv 1508 . 2 |- (A +H A) (_ A
111, 1shsub1 5342 . 2 |- A (_ (A +H A)
1210, 11eqssi 1517 1 |- (A +H A) = A
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196   = wceq 1091   e. wcel 1092  E.wrex 1202  (class class class)co 3001   +v cva 4959  SHcsh 4967   +H cph 4970
This theorem is referenced by:  shslub 5359
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  ax-hvaddcl 4984  ax-hvaddid 4988
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-ral 1205  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-sh 5114  df-shsum 5275
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