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At: mn 23 lem 0 1 2 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:(m-n+2). l:(m-i+1). P(l)

m:n. P(m)

By: Witness7 m-n+1

Generated subgoal:

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


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existsnatural_numberapplyaddsubtract
functionpropallimpliesless_than