Theorem bj-axun2 16278

Description: axun2 4526 from bounded separation. (Contributed by BJ, 15-Oct-2019.) (Proof modification is discouraged.)

Assertion

Ref	Expression
bj-axun2	|- E. y A. z ( z e. y <-> E. w ( z e. w /\ w e. x ) )

Distinct variable group:   x, w, y, z

Proof of Theorem bj-axun2

Step	Hyp	Ref	Expression
1		ax-bdel 16184	. . . 4 |- BOUNDED z e. w
2	1	ax-bdex 16182	. . 3 |- BOUNDED E. w e. x z e. w
3		df-rex 2514	. . . 4 |- ( E. w e. x z e. w <-> E. w ( w e. x /\ z e. w ) )
4		exancom 1654	. . . 4 |- ( E. w ( w e. x /\ z e. w ) <-> E. w ( z e. w /\ w e. x ) )
5	3, 4	bitri 184	. . 3 |- ( E. w e. x z e. w <-> E. w ( z e. w /\ w e. x ) )
6	2, 5	bd0 16187	. 2 |- BOUNDED E. w ( z e. w /\ w e. x )
7		ax-un 4524	. 2 |- E. y A. z ( E. w ( z e. w /\ w e. x ) -> z e. y )
8	6, 7	bdbm1.3ii 16254	1 |- E. y A. z ( z e. y <-> E. w ( z e. w /\ w e. x ) )

Syntax hints:   /\ wa 104   <-> wb 105   A.wal 1393   E.wex 1538   E.wrex 2509

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-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-14 2203  ax-un 4524  ax-bd0 16176  ax-bdex 16182  ax-bdel 16184  ax-bdsep 16247

This theorem depends on definitions:  df-bi 117  df-rex 2514

This theorem is referenced by: (None)