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Theorem ssiun 3690
Description: Subset implication for an indexed union. (Contributed by NM, 3-Sep-2003.) (Proof shortened by Andrew Salmon, 25-Jul-2011.)
Assertion
Ref Expression
ssiun  C  C_  C  C_  U_
Distinct variable group:   , C
Allowed substitution hints:   ()   ()

Proof of Theorem ssiun
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 ssel 2933 . . . . 5  C 
C_  C
21reximi 2410 . . . 4  C  C_  C
3 r19.37av 2457 . . . 4  C  C
42, 3syl 14 . . 3  C  C_  C
5 eliun 3652 . . 3  U_
64, 5syl6ibr 151 . 2  C  C_  C  U_
76ssrdv 2945 1  C  C_  C  C_  U_
Colors of variables: wff set class
Syntax hints:   wi 4   wcel 1390  wrex 2301    C_ wss 2911   U_ciun 3648
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bndl 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019
This theorem depends on definitions:  df-bi 110  df-tru 1245  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-nfc 2164  df-ral 2305  df-rex 2306  df-v 2553  df-in 2918  df-ss 2925  df-iun 3650
This theorem is referenced by:  iunss2  3693  iunpwss  3734  iunpw  4177
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