In this paper, author makes a study on the characteristics of idempotent matrix and involution matrix, and computes the number of idempotent matrices and involution matrices over finite field.
本文研究了幂等阵和对合阵的特性，并计算出有限域上幂等阵和对合阵的个数。
The utility model discloses an involution suction pipe. The middle part of the involution suction pipe is wound to form a spiral structure.
本实用新型公开一种回旋型吸管，该回旋型吸管的中间部分绕成螺旋结构。
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