Theorem seeq1 5086

Description: Equality theorem for the set-like predicate. (Contributed by Mario Carneiro, 24-Jun-2015.)

Assertion

Ref	Expression
seeq1	|- ( R = S -> ( R Se A <-> S Se A ) )

Proof of Theorem seeq1

Step	Hyp	Ref	Expression
1		eqimss2 3658	. . 3 |- ( R = S -> S C_ R )
2		sess1 5082	. . 3 |- ( S C_ R -> ( R Se A -> S Se A ) )
3	1, 2	syl 17	. 2 |- ( R = S -> ( R Se A -> S Se A ) )
4		eqimss 3657	. . 3 |- ( R = S -> R C_ S )
5		sess1 5082	. . 3 |- ( R C_ S -> ( S Se A -> R Se A ) )
6	4, 5	syl 17	. 2 |- ( R = S -> ( S Se A -> R Se A ) )
7	3, 6	impbid 202	1 |- ( R = S -> ( R Se A <-> S Se A ) )

Syntax hints:   -> wi 4   <-> wb 196   = wceq 1483   C_ wss 3574   Se wse 5071

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rab 2921  df-v 3202  df-in 3581  df-ss 3588  df-br 4654  df-se 5074

This theorem is referenced by:  oieq1  8417