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At: mn 23 lem 0 1 2 2 1

1. P: Prop
2. n:
3. k:{n...}. P(k) (i:k. P(i))
4. m:
5. P(m)
6. m < n
7. l:(m-(m-n+1)+1). P(l)

m:n. P(m)

By: Analyze 7

Generated subgoal:

17. l: (m-(m-n+1)+1)
8. P(l)
m:n. P(m)


About:
existsnatural_numberapplyfunctionprop
allimpliesless_thanaddsubtract