Theorem nfdh 1879

Description: Deduce that is not free in in a context. (Contributed by Mario Carneiro, 24-Sep-2016.)

Hypotheses

Ref	Expression
nfdh.1
nfdh.2

Assertion

Ref	Expression
nfdh

Proof of Theorem nfdh

Step	Hyp	Ref	Expression
1		nfdh.1	. . 3
2	1	nfi 1623	. 2
3		nfdh.2	. 2
4	2, 3	nfd 1878	1

Syntax hints:  ->wi 4  A.wal 1393  F/wnf 1616

This theorem is referenced by:  hbimd  1921  ax12indalem  2275  ax12inda2ALT  2276

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-12 1854

This theorem depends on definitions:  df-bi 185  df-ex 1613  df-nf 1617