Some years ago the author defined a pseudo inverse of a singular matrix and used it in representing a solution of normal equations and for obtaining variances and covariances of estimates in the ...

For any complex matrices A and W, m × n and n × m, respectively, it is proved that there exists a complex matrix X such that AXA = A, XAX = X, (AX)∗ = AX and XA(WA)k = (WA)k, where k is the index of ...

Maths Matrices Formulas: Matrices is one of the most important topics in mathematics. The CBSE Class 11 and 12 introduce students to many advanced concepts in mathematics, some of which have ...