Results for Classical Extremal Problems

  • Rudolf AhlswedeEmail author
Part of the Foundations in Signal Processing, Communications and Networking book series (SIGNAL, volume 13)


In order to prove Kraft’s ([7] inequality for prefix codes the codewords were regarded as vertices in a rooted tree. For any rooted tree it is possible to define a relation \(\preceq \), say, on the vertices of the tree by \(x\preceq y\), if and only if there exists a path from the root through x to y. This relation has the following properties (\(\mathcal{X}\) denotes the set of vertices of the tree)


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© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Department of MathematicsUniversity of BielefeldBielefeldGermany

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