Differential equations on closed subsets of a Banach space
Differential equations on closed subsets of a Banach space
In this paper the problem of existence of solutions to the initial value problem <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="u prime left-parenthesis t right-parenthesis equals upper A left-parenthesis t comma u left-parenthesis t right-parenthesis right-parenthesis comma u left-parenthesis a right-parenthesis equals z"> <mml:semantics> <mml:mrow> <mml:msup> <mml:mi>u</mml:mi> <mml:mo>′</mml:mo> </mml:msup> <mml:mo stretchy="false">(</mml:mo> <mml:mi>t</mml:mi> …