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Theorem shless 5348
Description: Subset implies subset of subspace sum.
Hypotheses
Ref Expression
shincl.1 AS
shincl.2 BS
shless.1 CS
Assertion
Ref Expression
shless (AB → (A + C) ⊆ (B + C))

Proof of Theorem shless
StepHypRef Expression
1 ssel 1502 . . . . . 6 (AB → (yAyB))
21anim1d 432 . . . . 5 (AB → ((yA ∧ ∃zC x = (y +v z)) → (yB ∧ ∃zC x = (y +v z))))
3219.22dv 947 . . . 4 (AB → (∃y(yA ∧ ∃zC x = (y +v z)) → ∃y(yB ∧ ∃zC x = (y +v z))))
4 df-rex 1206 . . . 4 (∃yAzC x = (y +v z) ↔ ∃y(yA ∧ ∃zC x = (y +v z)))
5 df-rex 1206 . . . 4 (∃yBzC x = (y +v z) ↔ ∃y(yB ∧ ∃zC x = (y +v z)))
63, 4, 53imtr4g 426 . . 3 (AB → (∃yAzC x = (y +v z) → ∃yBzC x = (y +v z)))
7 shincl.1 . . . 4 AS
8 shless.1 . . . 4 CS
97, 8shsel 5281 . . 3 (x ∈ (A + C) ↔ ∃yAzC x = (y +v z))
10 shincl.2 . . . 4 BS
1110, 8shsel 5281 . . 3 (x ∈ (B + C) ↔ ∃yBzC x = (y +v z))
126, 9, 113imtr4g 426 . 2 (AB → (x ∈ (A + C) → x ∈ (B + C)))
1312ssrdv 1509 1 (AB → (A + C) ⊆ (B + C))
Colors of variables: wff set class
Syntax hints:   → wi 2   ∧ wa 196  ∃wex 678   = wceq 1091   ∈ wcel 1092  ∃wrex 1202   ⊆ wss 1487  (class class class)co 3001   +v cva 4959   S csh 4967   + 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
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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