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Theorem shsel1t 5286
Description: A subspace sum contains a member of one of its subspaces.
Assertion
Ref Expression
shsel1t |- ((A e. SH /\ B e. SH) -> (C e. A -> C e. (A +H B)))

Proof of Theorem shsel1t
StepHypRef Expression
1 shelt 5118 . . . . 5 |- ((A e. SH /\ C e. A) -> C e. H~)
2 ax-hvaddid 4988 . . . . 5 |- (C e. H~ -> (C +v 0v) = C)
31, 2syl 12 . . . 4 |- ((A e. SH /\ C e. A) -> (C +v 0v) = C)
43adantlr 310 . . 3 |- (((A e. SH /\ B e. SH) /\ C e. A) -> (C +v 0v) = C)
5 sh0 5122 . . . . . 6 |- (B e. SH -> 0v e. B)
65adantl 305 . . . . 5 |- ((A e. SH /\ B e. SH) -> 0v e. B)
7 shsvat 5285 . . . . 5 |- ((A e. SH /\ B e. SH) -> ((C e. A /\ 0v e. B) -> (C +v 0v) e. (A +H B)))
86, 7mpan2d 525 . . . 4 |- ((A e. SH /\ B e. SH) -> (C e. A -> (C +v 0v) e. (A +H B)))
98imp 277 . . 3 |- (((A e. SH /\ B e. SH) /\ C e. A) -> (C +v 0v) e. (A +H B))
104, 9eqeltrrd 1164 . 2 |- (((A e. SH /\ B e. SH) /\ C e. A) -> C e. (A +H B))
1110exp 291 1 |- ((A e. SH /\ B e. SH) -> (C e. A -> C e. (A +H B)))
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196   = wceq 1091   e. wcel 1092  (class class class)co 3001  H~chil 4958   +v cva 4959  0vc0v 4961  SHcsh 4967   +H cph 4970
This theorem is referenced by:  shsel2t 5287  shsvst 5288  shsub1t 5289  shsel1 5335
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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