Nuprl - Proof: iter prod zero iff factor zero 1 1 1 2 1 1

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At: iter prod zero iff factor zero 1 1 1 2 1 1

1. a :

2. k :

3. 0<k
4.

b:

, e:({a..b

}

).
4. b-a = k-1

((

i:{a..b

}. e(i)) = 0

(Or i:{a..b

}. e(i) = 0))
5. b :

6. e : {a..b

}

7. b-a = k

(

i:{a..b-1

}. e(i)) = 0

e(b-1) = 0

(Or i:{a..b-1

}. e(i) = 0)

e(b-1) = 0

By:	Rewrite by Hyp:4

Generated subgoals:

None

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IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(13steps total) PrintForm Definitions Lemmas IteratedBinops Sections DiscrMathExt Doc