(5steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc
At:
mul
preserves
le
1
2
1
1.
a:
2.
b:
3.
a
b
4.
n:
5.
0 < n
6.
(n-1)
a
(n-1)
b
(n-1)
a+a
(n-1)
b+b
By:
BackThru
Thm*
i1,i2,j1,j2:
. i1
j1
i2
j2
i1+i2
j1+j2
Generated subgoals:
None
About:
(5steps)
PrintForm
Definitions
Lemmas
int
2
Sections
StandardLIB
Doc
b
a(n-1)b
(n-1)a+a(n-1)b+b
i1,i2,j1,j2:. i1j1 
i2j2 i1+i2j1+j2
