(5steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc
At:
mul
cancel
in
le
a,b:
, n:
. n
a
n
b
a
b
By:
Auto
Generated subgoal:
1
1.
a:
2.
b:
3.
n:
4.
n
a
n
b
a
b
About:
(5steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc