Theorem snriota 5713

Description: A restricted class abstraction with a unique member can be expressed as a singleton. (Contributed by NM, 30-May-2006.)

Assertion

Ref	Expression
snriota	|- ( E! x e. A ph -> { x e. A | ph } = { ( iota_ x e. A ph ) } )

Proof of Theorem snriota

Step	Hyp	Ref	Expression
1		df-reu 2397	. . 3 |- ( E! x e. A ph <-> E! x ( x e. A /\ ph ) )
2		sniota 5073	. . 3 |- ( E! x ( x e. A /\ ph ) -> { x | ( x e. A /\ ph ) } = { ( iota x ( x e. A /\ ph ) ) } )
3	1, 2	sylbi 120	. 2 |- ( E! x e. A ph -> { x | ( x e. A /\ ph ) } = { ( iota x ( x e. A /\ ph ) ) } )
4		df-rab 2399	. 2 |- { x e. A | ph } = { x | ( x e. A /\ ph ) }
5		df-riota 5684	. . 3 |- ( iota_ x e. A ph ) = ( iota x ( x e. A /\ ph ) )
6	5	sneqi 3505	. 2 |- { ( iota_ x e. A ph ) } = { ( iota x ( x e. A /\ ph ) ) }
7	3, 4, 6	3eqtr4g 2172	1 |- ( E! x e. A ph -> { x e. A | ph } = { ( iota_ x e. A ph ) } )

Syntax hints:   -> wi 4   /\ wa 103   = wceq 1314   e. wcel 1463   E!weu 1975   {cab 2101   E!wreu 2392   {crab 2394   {csn 3493   iotacio 5044   iota_crio 5683

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097

This theorem depends on definitions:  df-bi 116  df-tru 1317  df-nf 1420  df-sb 1719  df-eu 1978  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2244  df-rex 2396  df-reu 2397  df-rab 2399  df-v 2659  df-sbc 2879  df-un 3041  df-sn 3499  df-pr 3500  df-uni 3703  df-iota 5046  df-riota 5684

This theorem is referenced by:  divalgmod  11472