(14steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc
At:
decidable
ex
int
seg
1
1
1
1.
i:
2.
j:
3.
F:
{i..j
}
Prop
4.
k:{i..j
}. Dec(F(k))
5.
i
j
n:{...j}. i
n
Dec(
k:{n..j
}. F(k))
By:
BackThru
Thm*
i:
, E:({...i}
Prop). E(i)
(
k:{...i-1}. E(k+1)
E(k))
(
k:{...i}. E(k))
THEN
RepD
Generated subgoals:
1
6.
i
j
Dec(
k:{j..j
}. F(k))
2
6.
n:
{...j-1}
7.
i
n+1
Dec(
k:{(n+1)..j
}. F(k))
8.
i
n
Dec(
k:{n..j
}. F(k))
About:
(14steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc