Which of the following is a symmetric matrix? (A) a null matrix (B) a triangular matrix (C) an idenity matrix (D) a diagonal matrix

Which of the following is a skew symmetric matrix?

Which of the following is a triangular matrix? (A) a scalar matrix (B) a lower triangular matrix (C) an upper triangular matrix (D) a diagonal matrix

Square matrix and diagonal matrix

Null matrix upper triangular matrix and lower triangular matrix

A A' is always a symmetric matrix for any matrix A.

A matrix A=[a_(ij)] is an upper triangular matrix, if

Which of the following is/are incorrect? (i) adjoint of a symmetric matrix is symmetric (ii) adjoint of a unit matrix is a unit matrix (iii) A (adj A)=(adj A)A=absAI (iv) adjoint of a diagonal matrix is a diagonal matrix