Nuprl - Proof: edge-to 2 1 2

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At: edge-to 2 1 2

1. G : Id

2. to : |G|

(IdLnk List)
3. from : |G|

(IdLnk List)
4. e : Edge(G)
5. bi-graph(G;to;from)
6. Dec((e

to(destination(e))))

to(destination(e)))

By:	Analyze -1 THEN Try Trivial THEN Assert False

Generated subgoal:

1 6. (e to(destination(e)))
False
3 steps

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