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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-nnfnth | Structured version Visualization version GIF version |
Description: A variable is nonfree in the negation of a theorem, inference form. (Contributed by BJ, 27-Aug-2023.) |
Ref | Expression |
---|---|
bj-nnfnth.1 | ⊢ ¬ 𝜑 |
Ref | Expression |
---|---|
bj-nnfnth | ⊢ Ⅎ'𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-nnfnth.1 | . . 3 ⊢ ¬ 𝜑 | |
2 | 1 | bj-nnfth 34071 | . 2 ⊢ Ⅎ'𝑥 ¬ 𝜑 |
3 | bj-nnfnt 34069 | . 2 ⊢ (Ⅎ'𝑥𝜑 ↔ Ⅎ'𝑥 ¬ 𝜑) | |
4 | 2, 3 | mpbir 233 | 1 ⊢ Ⅎ'𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 Ⅎ'wnnf 34055 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-bj-nnf 34056 |
This theorem is referenced by: (None) |
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