Theorem dnegi-P3.29.CL 275

Description: Closed Form of dnegi-P3.29 273. †

Assertion

Ref	Expression
dnegi-P3.29.CL	⊢ (𝜑 → ¬ ¬ 𝜑)

Proof of Theorem dnegi-P3.29.CL

Step	Hyp	Ref	Expression
1		rcp-NDASM1of1 192	. 2 ⊢ (𝜑 → 𝜑)
2	1	dnegi-P3.29 273	1 ⊢ (𝜑 → ¬ ¬ 𝜑)

Syntax hints:  ¬ wff-neg 9   → wff-imp 10

This theorem was proved from axioms:  ax-L1 11  ax-L2 12  ax-L3 13  ax-MP 14

This theorem depends on definitions:  df-bi-D2.1 107  df-and-D2.2 133  df-true-D2.4 155

This theorem is referenced by:  dnegeq-P4.10  418  dnegeqint-P4.13  423  dfexistsint-P7  960