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by ndriscoll
673 days ago
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```case class Bidual[V](v: V) {
def apply(f: Dual[V]) = f(v)
} def unwrap[V](ff: Bidual[V]): V = ff.v``` There's both directions of the isomorphism explicitly defined in a programming language. No choice of basis needed to define the maps, only to prove that the constructor for Bidual really gives you all linear functionals on the dual. |
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