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PERMUTATION GROUPS WITH MULTIPLY-TRANSITIVE SUBORBITS, II PETER J. CAMERON In a previous paper with the same title [1], I considered the following situation; G is a primitive, not doubly transitive permutation group on Q, in which the stabiliser G of a point a acts doubly transitively on an orbit F(a), where |F(a)| = v. Manning [3] showed that, if v > 2, then G has an orbit larger than F(a). Indeed, with A = F* o T (see [1] for notation), it is easy to see that A(a) is a G -orbit and |A(a)| = v(v-l)/k, with k < v-l if v > 2. In [1], I showed that k < \{v-\) if v > 5. Furthermore, if G is triply transitive on F(a), then k = 0(i>*); if G is a a quadruply transitive on F(a), then k < 2. I remarked there that the truth is probably stronger that these results suggest, since essentially only two situations are known in which k > 2; these are the Mathieu group M (or its automorphism group) with v = 16, k = 4, |Q| = 77, and the Higman-Sims group HS (or its automorphism group) with v = 22,
Bulletin of the London Mathematical Society – Wiley
Published: Jul 1, 1974
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