fréchet derivatives
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Author(s):  
SHANE ARORA ◽  
HAZEL BROWNE ◽  
DANIEL DANERS

We discuss an alternative approach to Fréchet derivatives on Banach spaces inspired by a characterisation of derivatives due to Carathéodory. The approach allows many questions of differentiability to be reduced to questions of continuity. We demonstrate how that simplifies the theory of differentiation, including the rules of differentiation and the Schwarz lemma on the symmetry of second-order derivatives. We also provide a short proof of the differentiable dependence of fixed points in the Banach fixed point theorem.



2020 ◽  
Vol 510 ◽  
pp. 317-340 ◽  
Author(s):  
Debdas Ghosh ◽  
Ram Surat Chauhan ◽  
Radko Mesiar ◽  
Amit Kumar Debnath


2020 ◽  
Vol 64 (1) ◽  
pp. 26-75
Author(s):  
Hao Zhao ◽  
Anders Ueland Waldeland ◽  
Dany Rueda Serrano ◽  
Martin Tygel ◽  
Einar Iversen


2019 ◽  
Vol 113 (3) ◽  
pp. 301-312
Author(s):  
Shuyuan Guo ◽  
Guixin Xu ◽  
Meirong Zhang




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