be a Banach space, V⊂X
is its subspace and U⊂X*. Given x∈X, we are looking for v∈V such
that u(v)=u(x)
for all u∈U and ‖v‖≤M‖x‖. In
this article, we study the restrictions placed on the constant M
as a function of X,V, and U.">
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