nfntOLDOLD - Metamath Proof Explorer

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Theorem nfntOLDOLD 1783

Description: Obsolete proof of nfnt 1782 as of 3-Nov-2021. (Contributed by Mario Carneiro, 24-Sep-2016.) (Proof shortened by Wolf Lammen, 28-Dec-2017.) (Revised by BJ, 24-Jul-2019.) df-nf 1710 changed. (Revised by Wolf Lammen, 4-Oct-2021.) (Proof modification is discouraged.) (New usage is discouraged.)

**Assertion**
Ref	Expression
nfntOLDOLD

**Proof of Theorem nfntOLDOLD**
Step	Hyp	Ref	Expression
1		notnot 136	. . . . 5
2	1	alimi 1739	. . . 4
3	2	orim1i 539	. . 3 $\/$ $\/$
4		pm1.4 401	. . 3 $\/$ $\/$
5	3, 4	syl 17	. 2 $\/$ $\/$
6		nf3 1712	. 2 $\/$
7		nf3 1712	. 2 $\/$
8	5, 6, 7	3imtr4i 281	1

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4 $\/$ wo 383

wal 1481

wnf 1708

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737

This theorem depends on definitions: df-bi 197 df-or 385 df-ex 1705 df-nf 1710

This theorem is referenced by: (None)

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