Szukana fraza: [Abstract = "Let F be a multivalued map from I \:= \[a, b\] into IR2 defined by F\(t\) = \{h\(t\), f\(t\)\}, where f and h are continuous maps from I into IR2. The aim of this paper is to find the necessary and sufficient conditions on the mappings f and h for an integral of F to be a convex polygon."]

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