Differential Equations & Applications · Volume 7, Issue 1 Evolution equations with causal operators 07-02 Pages 15-26 DOI 10.7153/dea-07-02 Downloads Short PDF Full PDF PNG Authors Ravi P. Agarwal Sadia Arshad Vasile Lupulescu Donal O'Regan Keywords evolution equation causal operator initial value problem Subject classes 34A07 34A08