At: phole aux 2 1 1 1 2 1 3
1. n: {2...}
2.
f:(
n

(-1+n)).
i:
n, j:
i. f(i) = f(j)
3. f:
(1+n)

n
4.
ii:{1..(1+n)
}, jj:
ii.
f(ii) = f(jj)
5. i:
n
6. j:
i
7.
f(i) = n-1
8. f(j) = n-1
f(i) = f(n)
(-1+n) 
(
i:
1, j:
i. f(i) = f(j))
By:
Inst [n;i] 4
THEN
Inst [n;j] 4
Generated subgoals:None
About: