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At: mn 23 lem 0 1 2 1 1 2 1 2
1. P: Prop
2. n:
3. k:{n...}. P(k) (i:k. P(i))
4. m:
5. P(m)
6. m < n
7. i:
8. 0 < i
9. i < m-n+2
10. l: (m-(i-1)+1)
11. P(l)
12. l < m-i+1

l:(m-i+1). P(l)
By: Witness3 l
Generated subgoal:

13. m:
4. P(m)
5. m < n
6. i:
7. 0 < i
8. i < m-n+2
9. l: (m-(i-1)+1)
10. P(l)
11. l < m-i+1
12. P(l) (i:l. P(i))
l:(m-i+1). P(l)

About:
existsnatural_numberaddsubtractapplyfunction
propallimpliesless_thanint