Theorem nfel2 2405

Description: Hypothesis builder for elementhood, special case. (Contributed by Mario Carneiro, 10-Oct-2016.)

Hypothesis

Ref	Expression
nfeq2.1	|- F/_ x B

Assertion

Ref	Expression
nfel2	|- F/ x A e. B

Distinct variable group:   x, A

Allowed substitution hint:   B( x)

Proof of Theorem nfel2

Step	Hyp	Ref	Expression
1		nfcv 2392	. 2 |- F/_ x A
2		nfeq2.1	. 2 |- F/_ x B
3	1, 2	nfel 2401	1 |- F/ x A e. B

This proof depends on syntax axioms:   F/wnf 1513   e. wcel 2209   F/_wnfc 2379

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-cleq 2231  df-clel 2234  df-nfc 2381

This theorem is used by:  elabgt  2967  opelopabsb  4402  eliunxp  4919  opeliunxp2  4920  tz6.12f  5724  0neqopab  6133  disjxp1  6472  opeliunxp2f  6509  cbvixp  6997  reuccatpfxs1  11519  ctiunct  13331