Gateaux and Frechet derivatives notation

[racnna]

Homework Statement

https://imagizer.imageshack.us/v2/622x210q90/833/sqaw.png


I am having difficulty understanding the notation <h, f''(x0)h>

 

[racnna]

Hi guys..Here is a very short document on gateaux and frechet derivatives.

http://www.scribd.com/doc/205731037/Optimization-of-Functionals

any help will be appreciated