ABSTRACT
In this brief chapter we consider the following second order evolution equation () { x ″ ( t ) + γ x ′ ( t ) + A ( x ( x ) ) ∋ 0 , a.e. t ≥ 0 x ( 0 ) = x 0 , x ′ ( 0 ) = x 1 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429156908/6b59fc70-f121-4321-b34a-0baf5e3a2176/content/eq1193.tif"/>
