The splitting lemmas for nonsmooth functionals on Hilbert spaces II. The case at infinity

Guangcun Lu

Published 2012-11-06, updated 2015-01-25Version 2

We generalize the Bartsch-Li's splitting lemma at infinity for $C^2$-functionals in [2] and some later variants of it to a class of continuously directional differentiable functionals on Hilbert spaces. Different from the previous flow methods our proof is to combine the ideas of the Morse-Palais lemma due to Duc-Hung-Khai [9] with some techniques from [11], [17], [18]. A simple application is also presented.