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# 006 - >>The latter Let me further clarify>No Degree...

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Posted on 14 April 2009 09:49 >>>I want to ask in Q3, We have to prove "3D <=p CNFSAT" or "CNFSAT <=p 3D"? >>Q3 asks for a polynomial time algorithm to reduce 3D matching to CNFSAT. The other direction can be found in most textbooks, you are welcome to read it. >so is which one? I cannot understand since the notes uses "is reductible to". Q3 asks for a polynomial time algorithm to illustrate that 3D matching is reducible to CNFSAT. >>>Also, in Q4, I want to ask span-2 tree means "a node with at most 2 degree in graph" or >>>"a node with at most 2 degree in tree which means a node have at most 2 children"?
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Unformatted text preview: >>The latter. Let me further clarify: >No. Degree 2 means 2 neighbors (no matter what they are). As mentioned earlier, G is undirected and its spanning tree is unrooted. >>>Note that G as well as any of its spanning tree are undirected >>>graphs. >>The problem SPAN-2 asks for a spanning tree T such that every node u of T has at most 2 >>neighbors. Note that a node u in the original >>graph G might have 2 or more neighbors. >What is the input parameter g ? The input to the Clique problem has two parts: a graph and a parameter g, we want to find a clique of size g. Tak...
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