Theorem nfoprab2 5925

Description: The abstraction variables in an operation class abstraction are not free. (Contributed by NM, 25-Apr-1995.) (Revised by David Abernethy, 30-Jul-2012.)

Assertion

Ref	Expression
nfoprab2	|- F/_ y { <. <. x , y >. , z >. | ph }

Proof of Theorem nfoprab2

Dummy variable w is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-oprab 5879	. 2 |- { <. <. x , y >. , z >. | ph } = { w | E. x E. y E. z ( w = <. <. x , y >. , z >. /\ ph ) }
2		nfe1 1496	. . . 4 |- F/ y E. y E. z ( w = <. <. x , y >. , z >. /\ ph )
3	2	nfex 1637	. . 3 |- F/ y E. x E. y E. z ( w = <. <. x , y >. , z >. /\ ph )
4	3	nfab 2324	. 2 |- F/_ y { w | E. x E. y E. z ( w = <. <. x , y >. , z >. /\ ph ) }
5	1, 4	nfcxfr 2316	1 |- F/_ y { <. <. x , y >. , z >. | ph }

Syntax hints:   /\ wa 104   = wceq 1353   E.wex 1492   {cab 2163   F/_wnfc 2306   <.cop 3596   {coprab 5876

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-oprab 5879

This theorem is referenced by:  ssoprab2b  5932  nfmpo2  5943  ovi3  6011  tposoprab  6281