Chen, Guanhua; Chen, Guizhang Strong involutory matrix and its nature. (Chinese. English summary) Zbl 1173.15016 J. Henan Univ., Nat. Sci. 38, No. 6, 559-561 (2008). Summary: On the basis of an involutory matrix, this paper develops a concept of a strong involutory matrix, discusses its basic nature, and some conditions of equal value, thus enriching the contents of an involutory matrix. At last, it discusses the relationship between a strong involutory matrix and a sub-strong sub-orthogonal matrix. MSC: 15B57 Hermitian, skew-Hermitian, and related matrices Keywords:involutory matrix; strong involutory matrix; nature; orthogonal matrix PDFBibTeX XMLCite \textit{G. Chen} and \textit{G. Chen}, J. Henan Univ., Nat. Sci. 38, No. 6, 559--561 (2008; Zbl 1173.15016)