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Theorem ssunieq 4284
 Description: Relationship implying union. (Contributed by NM, 10-Nov-1999.)
Assertion
Ref Expression
ssunieq
Distinct variable groups:   ,   ,

Proof of Theorem ssunieq
StepHypRef Expression
1 elssuni 4279 . . 3
2 unissb 4281 . . . 4
32biimpri 206 . . 3
41, 3anim12i 566 . 2
5 eqss 3518 . 2
64, 5sylibr 212 1
 Colors of variables: wff setvar class Syntax hints:  ->wi 4  /\wa 369  =wceq 1395  e.wcel 1818  A.wral 2807  C_wss 3475  U.cuni 4249 This theorem is referenced by:  unimax  4285  shsspwh  26164 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435 This theorem depends on definitions:  df-bi 185  df-an 371  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ral 2812  df-v 3111  df-in 3482  df-ss 3489  df-uni 4250
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