Let X be a locally convex space and X~* its dual space.Let N(X) denote a localbase neighborhoods 0∈X which are barrells.For each U∈N(X),letP_U(x)=sup{|f(x)|:f∈U^0}, (?)x∈X,where U^0 is polar of U with respect to t...Let X be a locally convex space and X~* its dual space.Let N(X) denote a localbase neighborhoods 0∈X which are barrells.For each U∈N(X),letP_U(x)=sup{|f(x)|:f∈U^0}, (?)x∈X,where U^0 is polar of U with respect to the dual pair (X, X~*).Then P_U is a continuousseminorm on X. Pietsch gave the vector-valued sequence space l_1[X] as follows:展开更多
文摘Let X be a locally convex space and X~* its dual space.Let N(X) denote a localbase neighborhoods 0∈X which are barrells.For each U∈N(X),letP_U(x)=sup{|f(x)|:f∈U^0}, (?)x∈X,where U^0 is polar of U with respect to the dual pair (X, X~*).Then P_U is a continuousseminorm on X. Pietsch gave the vector-valued sequence space l_1[X] as follows:
