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Theorem shsidm 9357
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 9280 . . . 4 |- (x e. (A +H A) <-> E.y e. A E.z e. A x = (y +h z))
3 eleq1 1534 . . . . . 6 |- (x = (y +h z) -> (x e. A <-> (y +h z) e. A))
4 shaddcltOLD 9086 . . . . . . 7 |- (A e. SH -> ((y e. A /\ z e. A) -> (y +h z) e. A))
51, 4ax-mp 7 . . . . . 6 |- ((y e. A /\ z e. A) -> (y +h z) e. A)
63, 5syl5cbir 211 . . . . 5 |- ((y e. A /\ z e. A) -> (x = (y +h z) -> x e. A))
76r19.23aivv 1748 . . . 4 |- (E.y e. A E.z e. A x = (y +h z) -> x e. A)
82, 7sylbi 199 . . 3 |- (x e. (A +H A) -> x e. A)
98ssriv 2069 . 2 |- (A +H A) (_ A
101, 1shsub1 9341 . 2 |- A (_ (A +H A)
119, 10eqssi 2078 1 |- (A +H A) = A
Colors of variables: wff set class
Syntax hints:   -> wi 3   /\ wa 223   = wceq 956   e. wcel 958  E.wrex 1646  (class class class)co 3963   +h cva 8789  SHcsh 8797   +H cph 8800
This theorem is referenced by:  shslub 9358
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-9 965  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779  ax-un 2866  ax-hilex 8869  ax-hfvadd 8870  ax-hvaddid 8874
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3an 777  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-ral 1649  df-rex 1650  df-rab 1652  df-v 1812  df-sbc 1942  df-csb 2002  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-cnv 3186  df-co 3187  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fun 3192  df-fn 3193  df-f 3194  df-fv 3198  df-opr 3965  df-oprab 3966  df-sh 9076  df-shsum 9273
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