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Mirrors > Home > MPE Home > Th. List > nf3orOLD | Structured version Visualization version Unicode version |
Description: Obsolete proof of nf3or 1835 as of 6-Oct-2021. (Contributed by Mario Carneiro, 11-Aug-2016.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nfOLD.1 | |
nfOLD.2 | |
nfOLD.3 |
Ref | Expression |
---|---|
nf3orOLD |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-3or 1038 | . 2 | |
2 | nfOLD.1 | . . . 4 | |
3 | nfOLD.2 | . . . 4 | |
4 | 2, 3 | nforOLD 2244 | . . 3 |
5 | nfOLD.3 | . . 3 | |
6 | 4, 5 | nforOLD 2244 | . 2 |
7 | 1, 6 | nfxfrOLD 1837 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wo 383 w3o 1036 wnfOLD 1709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-12 2047 |
This theorem depends on definitions: df-bi 197 df-or 385 df-3or 1038 df-ex 1705 df-nf 1710 df-nfOLD 1721 |
This theorem is referenced by: (None) |
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