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The authors survey some recent results concerning the question when the equality HomA=E holds for a subalgebra A of the algebra C(E) of continuous real-valued functions on a real Banach space E. A new natural proof for this equality is given in [...]texto impreso
A congruence of lines is a (n?1)-dimensional family of lines in Pn (over C), i.e. a variety Y of dimension (and hence of codimension) n ? 1 in the Grassmannian Gr(1, Pn). A fundamental curve for Y is a curve C Pn which meets all the lines of Y [...]
