Nuprl - Proof: decidable ex int seg 1

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At: decidable ex int seg 1

1. i :

2. j :

3. F : {i..j

}

Prop
4.

k:{i..j

}. Dec(F(k))

Dec(

k:{i..j

}. F(k))

By:	Decide: ij

Generated subgoals:

1 5. ij
Dec(k:{i..j}. F(k))
5 steps

2 5. ij
Dec(k:{i..j}. F(k))
2 steps

About:

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1	5. ij Dec(k:{i..j}. F(k))	5 steps
2	5. ij Dec(k:{i..j}. F(k))	2 steps