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Mirrors > Home > ILE Home > Th. List > nftru | GIF version |
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1421, but this proof does not use ax-17 1419.) (Contributed by Mario Carneiro, 6-Oct-2016.) |
Ref | Expression |
---|---|
nftru | ⊢ Ⅎ𝑥⊤ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tru 1247 | . 2 ⊢ ⊤ | |
2 | 1 | nfth 1353 | 1 ⊢ Ⅎ𝑥⊤ |
Colors of variables: wff set class |
Syntax hints: ⊤wtru 1244 Ⅎwnf 1349 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-gen 1338 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 |
This theorem is referenced by: nfmo 1920 dvelimc 2198 nfralxy 2360 nfrexxy 2361 nfralya 2362 nfrexya 2363 nfreuxy 2484 nfsbc 2784 nfcsb 2884 nfiotaxy 4871 nfriota 5477 |
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