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

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At: iter prod zero iff factor zero 1 2 1

1. a :

2.

b:

, e:({a..b

}

).
2. a

b

((

i:{a..b

}. e(i)) = 0

(Or i:{a..b

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

4. e : {a..b

}

5. a

b

(

i:{a..b

}. e(i)) = 0

(Or i:{a..b

}. e(i) = 0)

By:	Guarding (<prop> <prop>) BackThru: Hyp:2

Generated subgoals:

None

About:

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