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Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition
book

Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition

by Jan R. Magnus, Heinz Neudecker
March 2019
Intermediate to advanced
504 pages
11h 3m
English
Wiley
Content preview from Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition

Chapter 8Some important differentials

1 INTRODUCTION

Now that we know what differentials are and have adopted a convenient and simple notation for them our next step is to determine the differentials of some important functions. We shall discuss the differentials of some scalar functions of X (eigenvalue, determinant), a vector function of X (eigenvector), and some matrix functions of X (inverse, Moore‐Penrose (MP) inverse, adjoint matrix).

But first, we must list the basic rules.

2 FUNDAMENTAL RULES OF DIFFERENTIAL CALCULUS

The following rules are easily verified. If u and v are real‐valued differentiable functions and α is a real constant, then we have

(1)equation
(2)equation
(3)equation

and also

(4)equation
(5)equation

The differential of the power function is

(6)equation

where the domain of definition of the power function uα depends on the arithmetical nature of α. If α is a positive integer, then uα is defined for all real u; but ...

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ISBN: 9781119541202Purchase book