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Theorem shinclt 9351
Description: Closure of intersection of two subspaces.
Assertion
Ref Expression
shinclt |- ((A e. SH /\ B e. SH) -> (A i^i B) e. SH)

Proof of Theorem shinclt
StepHypRef Expression
1 ineq1 2210 . . 3 |- (A = if(A e. SH, A, H~) -> (A i^i B) = (if(A e. SH, A, H~) i^i B))
21eleq1d 1540 . 2 |- (A = if(A e. SH, A, H~) -> ((A i^i B) e. SH <-> (if(A e. SH, A, H~) i^i B) e. SH))
3 ineq2 2211 . . 3 |- (B = if(B e. SH, B, H~) -> (if(A e. SH, A, H~) i^i B) = (if(A e. SH, A, H~) i^i if(B e. SH, B, H~)))
43eleq1d 1540 . 2 |- (B = if(B e. SH, B, H~) -> ((if(A e. SH, A, H~) i^i B) e. SH <-> (if(A e. SH, A, H~) i^i if(B e. SH, B, H~)) e. SH))
5 helsh 9117 . . . 4 |- H~ e. SH
65elimel 2394 . . 3 |- if(A e. SH, A, H~) e. SH
75elimel 2394 . . 3 |- if(B e. SH, B, H~) e. SH
86, 7shincl 9331 . 2 |- (if(A e. SH, A, H~) i^i if(B e. SH, B, H~)) e. SH
92, 4, 8dedth2h 2387 1 |- ((A e. SH /\ B e. SH) -> (A i^i B) e. SH)
Colors of variables: wff set class
Syntax hints:   -> wi 3   /\ wa 223   = wceq 956   e. wcel 958   i^i cin 2046  ifcif 2361  H~chil 8788  SHcsh 8797
This theorem is referenced by:  orthin 9370  sumdmdi 10342
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-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-hv0cl 8873  ax-hfvmul 8875
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-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-if 2362  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-int 2534  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-hlim 8841  df-sh 9076  df-ch 9092
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