Exercise 2.4.6

Answers

$AB = \sum a_{j} b_{j}^{T}$ , also for any matrices $A, B$ , we have $| A + B | \leq | A | + | B |$ , so we have

$| AB |_{F}^{2} = | \sum a_{j} b_{j}^{T} |_{F}^{2} \leq {(\sum | a_{j} b_{j}^{T} |)}^{2} \leq {(\sum | a_{j} | | b_{j}^{T} |)}^{2}$

niuers

2020-03-20 00:00