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Theorem ssprr 3719
Description: The subsets of a pair. (Contributed by Jim Kingdon, 11-Aug-2018.)
Assertion
Ref Expression
ssprr  |-  ( ( ( A  =  (/)  \/  A  =  { B } )  \/  ( A  =  { C }  \/  A  =  { B ,  C }
) )  ->  A  C_ 
{ B ,  C } )

Proof of Theorem ssprr
StepHypRef Expression
1 0ss 3432 . . . 4  |-  (/)  C_  { B ,  C }
2 sseq1 3151 . . . 4  |-  ( A  =  (/)  ->  ( A 
C_  { B ,  C }  <->  (/)  C_  { B ,  C } ) )
31, 2mpbiri 167 . . 3  |-  ( A  =  (/)  ->  A  C_  { B ,  C }
)
4 snsspr1 3704 . . . 4  |-  { B }  C_  { B ,  C }
5 sseq1 3151 . . . 4  |-  ( A  =  { B }  ->  ( A  C_  { B ,  C }  <->  { B }  C_  { B ,  C } ) )
64, 5mpbiri 167 . . 3  |-  ( A  =  { B }  ->  A  C_  { B ,  C } )
73, 6jaoi 706 . 2  |-  ( ( A  =  (/)  \/  A  =  { B } )  ->  A  C_  { B ,  C } )
8 snsspr2 3705 . . . 4  |-  { C }  C_  { B ,  C }
9 sseq1 3151 . . . 4  |-  ( A  =  { C }  ->  ( A  C_  { B ,  C }  <->  { C }  C_  { B ,  C } ) )
108, 9mpbiri 167 . . 3  |-  ( A  =  { C }  ->  A  C_  { B ,  C } )
11 eqimss 3182 . . 3  |-  ( A  =  { B ,  C }  ->  A  C_  { B ,  C }
)
1210, 11jaoi 706 . 2  |-  ( ( A  =  { C }  \/  A  =  { B ,  C }
)  ->  A  C_  { B ,  C } )
137, 12jaoi 706 1  |-  ( ( ( A  =  (/)  \/  A  =  { B } )  \/  ( A  =  { C }  \/  A  =  { B ,  C }
) )  ->  A  C_ 
{ B ,  C } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 698    = wceq 1335    C_ wss 3102   (/)c0 3394   {csn 3560   {cpr 3561
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2139
This theorem depends on definitions:  df-bi 116  df-tru 1338  df-nf 1441  df-sb 1743  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-v 2714  df-dif 3104  df-un 3106  df-in 3108  df-ss 3115  df-nul 3395  df-pr 3567
This theorem is referenced by:  sstpr  3720  pwprss  3768
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