Talk:Kirchhoff's theorem

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I copied the original material from spanning tree (mathematics) and added a different formulation of Kirchhoff's theorem using the cofactor of the admittance matrix. Then I wrote a new article admittance matrix and deleted most of the explaination on this page in terms of discrete Laplace operator (which was just a definition of the admittance matrix). Now the article is quite terse, perhaps someone else can add some material to illustrate the theorem. Although I do not think it is a good idea to duplicate the definition of the admittance matrix here. MathMartin 17:32, 30 Jan 2005 (UTC)