Users' Mathboxes Mathbox for Andrew Salmon < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  trelpss Unicode version

Theorem trelpss 27029
Description: An element of a transitive set is a proper subset of it. Theorem 7.2 in [TakeutiZaring] p. 35. Unlike tz7.2 4349, ax-reg 7274 is required for its proof. (Contributed by Andrew Salmon, 13-Nov-2011.)
Assertion
Ref Expression
trelpss  |-  ( ( Tr  A  /\  B  e.  A )  ->  B  C.  A )

Proof of Theorem trelpss
StepHypRef Expression
1 zfregfr 7284 . . 3  |-  _E  Fr  A
2 tz7.2 4349 . . 3  |-  ( ( Tr  A  /\  _E  Fr  A  /\  B  e.  A )  ->  ( B  C_  A  /\  B  =/=  A ) )
31, 2mp3an2 1270 . 2  |-  ( ( Tr  A  /\  B  e.  A )  ->  ( B  C_  A  /\  B  =/=  A ) )
4 df-pss 3143 . 2  |-  ( B 
C.  A  <->  ( B  C_  A  /\  B  =/= 
A ) )
53, 4sylibr 205 1  |-  ( ( Tr  A  /\  B  e.  A )  ->  B  C.  A )
Colors of variables: wff set class
Syntax hints:    -> wi 6    /\ wa 360    e. wcel 1621    =/= wne 2421    C_ wss 3127    C. wpss 3128   Tr wtr 4087    _E cep 4275    Fr wfr 4321
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-5 1533  ax-6 1534  ax-7 1535  ax-gen 1536  ax-8 1623  ax-11 1624  ax-14 1626  ax-17 1628  ax-12o 1664  ax-10 1678  ax-9 1684  ax-4 1692  ax-16 1927  ax-ext 2239  ax-sep 4115  ax-nul 4123  ax-pr 4186  ax-reg 7274
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3an 941  df-tru 1315  df-ex 1538  df-nf 1540  df-sb 1884  df-eu 2122  df-mo 2123  df-clab 2245  df-cleq 2251  df-clel 2254  df-nfc 2383  df-ne 2423  df-ral 2523  df-rex 2524  df-rab 2527  df-v 2765  df-sbc 2967  df-dif 3130  df-un 3132  df-in 3134  df-ss 3141  df-pss 3143  df-nul 3431  df-if 3540  df-sn 3620  df-pr 3621  df-op 3623  df-uni 3802  df-br 3998  df-opab 4052  df-tr 4088  df-eprel 4277  df-fr 4324
  Copyright terms: Public domain W3C validator