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The Chromatic Number of The Kneser Graphs

Book: Algebraic Graph Theory written by Chris Godsil, Gordon Royle, chapter 7 Kneser Graphs.
The task is the following:
Work out the pages 136-138 . These are the topics and the questions to be solved:
7.2 Fractional cliques:
1. Why is w*(x) greater than w(x) ?
2. Why is g a fractional clique ?
3. Proof Lemma 7.2.1
4. Proof of Lemma 7.2.2 : If X is vertex transitive, why is then g^ constant on the vertices of X ? Why is c1 a fractional clique ?
5. How does the result follow ?
7.3 Fractional chromatic number
1. How is the f the same thing as a fractional colouring ? Create an example for that
2. Proof Theorem 7.3.2 (very important !)
3. Proof Lemma 7.3.1

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