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Mirrors > Home > NFE Home > Th. List > nfnth | Unicode version |
Description: No variable is (effectively) free in a non-theorem. (Contributed by Mario Carneiro, 6-Dec-2016.) |
Ref | Expression |
---|---|
nfnth.1 |
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Ref | Expression |
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nfnth |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfnth.1 |
. . 3
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2 | 1 | pm2.21i 123 |
. 2
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3 | 2 | nfi 1551 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 |
This theorem depends on definitions: df-bi 177 df-nf 1545 |
This theorem is referenced by: (None) |
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