Theorem wetrep 4396

Description: An epsilon well-ordering is a transitive relation. (Contributed by NM, 22-Apr-1994.)

Assertion

Ref	Expression
wetrep	|- ( ( _E We A /\ ( x e. A /\ y e. A /\ z e. A ) ) -> ( ( x e. y /\ y e. z ) -> x e. z ) )

Distinct variable group:   x, A, y, z

Proof of Theorem wetrep

Step	Hyp	Ref	Expression
1		df-3an 982	. . 3 |- ( ( x e. A /\ y e. A /\ z e. A ) <-> ( ( x e. A /\ y e. A ) /\ z e. A ) )
2		df-wetr 4370	. . . . . . . . 9 |- ( _E We A <-> ( _E Fr A /\ A. x e. A A. y e. A A. z e. A ( ( x _E y /\ y _E z ) -> x _E z ) ) )
3	2	simprbi 275	. . . . . . . 8 |- ( _E We A -> A. x e. A A. y e. A A. z e. A ( ( x _E y /\ y _E z ) -> x _E z ) )
4	3	r19.21bi 2585	. . . . . . 7 |- ( ( _E We A /\ x e. A ) -> A. y e. A A. z e. A ( ( x _E y /\ y _E z ) -> x _E z ) )
5	4	r19.21bi 2585	. . . . . 6 |- ( ( ( _E We A /\ x e. A ) /\ y e. A ) -> A. z e. A ( ( x _E y /\ y _E z ) -> x _E z ) )
6	5	anasss 399	. . . . 5 |- ( ( _E We A /\ ( x e. A /\ y e. A ) ) -> A. z e. A ( ( x _E y /\ y _E z ) -> x _E z ) )
7	6	r19.21bi 2585	. . . 4 |- ( ( ( _E We A /\ ( x e. A /\ y e. A ) ) /\ z e. A ) -> ( ( x _E y /\ y _E z ) -> x _E z ) )
8	7	anasss 399	. . 3 |- ( ( _E We A /\ ( ( x e. A /\ y e. A ) /\ z e. A ) ) -> ( ( x _E y /\ y _E z ) -> x _E z ) )
9	1, 8	sylan2b 287	. 2 |- ( ( _E We A /\ ( x e. A /\ y e. A /\ z e. A ) ) -> ( ( x _E y /\ y _E z ) -> x _E z ) )
10		epel 4328	. . 3 |- ( x _E y <-> x e. y )
11		epel 4328	. . 3 |- ( y _E z <-> y e. z )
12	10, 11	anbi12i 460	. 2 |- ( ( x _E y /\ y _E z ) <-> ( x e. y /\ y e. z ) )
13		epel 4328	. 2 |- ( x _E z <-> x e. z )
14	9, 12, 13	3imtr3g 204	1 |- ( ( _E We A /\ ( x e. A /\ y e. A /\ z e. A ) ) -> ( ( x e. y /\ y e. z ) -> x e. z ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 980   e. wcel 2167   A.wral 2475   class class class wbr 4034   _E cep 4323   Fr wfr 4364   We wwe 4366

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-v 2765  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-br 4035  df-opab 4096  df-eprel 4325  df-wetr 4370

This theorem is referenced by:  wessep  4615