POSITIVE SOLUTIONS OF INTEGRODIFFENTL EQUATIONS
Ch. G. Philos, P. O. Boz · 1993
Integrodifferential equations of the forms z’(t) + p(t) / K(t s)x(s)ds 0 and z’(t)+ q(t) / K(t- s)x(s)ds 0 0---o are considered, where K E C([0, oo),[0, oo)), p E C([0,), [0, oo)) and q C( ( oo, oo), [0, oo)). Necessary conditions and also sufficient conditions for the existence of positive solutions are established.