Next
Prev
Up
NotDiEqvBiNot
⊢
¬
f
≡
¬
f
NotDiEqvBiNot
Proof:
1
⊢
f
≡¬¬
f
Prop
2
⊢
f
≡
¬¬
f
1
,
DiEqvDi
3
⊢ ¬
f
≡¬
¬¬
f
2
,
Prop
4
⊢ ¬
f
≡
¬
f
3
,
def. of
qed
Next
Prev
Up
2023-09-12
Contact
|
Home
|
ITL home
|
Course
|
Proofs
|
Algebra
|
FL
© 1996-2023