The Number of Irreducible Subsystems in the Classical Irreducible Root Systems

The Number of Irreducible Subsystems in the Classical Irreducible Root Systems

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摘要 Let Φ be an irreducible root system of classical type. In t his short note, we study the irreducible subsystems of Φ and compute the nu mber of irreducible subsystems of any rank k in Φ. Let Φ be an irreducible root system of classical type. In t his short note, we study the irreducible subsystems of Φ and compute the nu mber of irreducible subsystems of any rank k in Φ.

作者徐祥

出处《Northeastern Mathematical Journal》 CSCD 2000年第3期287-290,共4页 东北数学（英文版）

基金 The NSF (19601011) of China.

关键词 root system base positive root root system, base, positive root

分类号 O152.4 [理学—基础数学]

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Northeastern Mathematical Journal

2000年第3期

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The Number of Irreducible Subsystems in the Classical Irreducible Root Systems

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