2.3 Characterization of Invertible Matrices

Question 1

Theorem 8

Answer 1

Invertible Matrix Theorem

Question 2

Upper Triangular Matrix

Answer 2

An mxn upper triangular matrix is one whose entries below the main diagonal are 0s.

Question 3

Lower Triangular Matrix

Answer 3

An mxn lower triangular matrix is one whose entries above the main diagonal are 0s.