Tag Archives: graph


Time to generalise from the preceding examples. There are several good reasons why a choice of definitions is a good thing. First, as several points in the discussion of graphs suggested, different definitions may be adapted for different kinds of … Continue reading

Posted in exposition, mathematics | Tagged , , , | 3 Comments


The first mathematics book that I read really seriously was Helmut Wielandt’s Finite Permutation Groups. So I have known the definition of a primitive permutation group for more than forty years. But there is still more to learn. My recent … Continue reading

Posted in exposition, open problems | Tagged , , , | Leave a comment