Let G be a finite group, and let Delta(G) denote the prime graph built on the set of degrees of the irreducible complex characters of G. It is well known that, whenever Delta(G) is connected, the diameter of Delta(G) is at most 3. In the present paper, we provide a description of the finite solvable groups for which the diameter of this graph attains the upper bound. This also enables us to confirm a couple of conjectures proposed by M. L. Lewis.
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机译:令G为有限群,让Delta(G)表示建立在G的不可约复性的度数集上的素数图。众所周知,每当Delta(G)连接时,Delta( G)最多为3。在本文中,我们描述了此图的直径达到上限的有限可解基团。这也使我们能够确认M. L. Lewis提出的两个猜想。
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