DH Wagner - SIAM Journal on Control and Optimization, 1977 - search.proquest.com
Abstract Suppose $(T,\mathcal {M}) $ is a measurable space, $ X $ is a topological space,
and $\emptyset\ne F (t)\subset X $ for $ t\in T $. Denote ${\operatorname {Gr}} F=\{(t, x): x\in F …