Top network posts

• 14 Given $T \in L(X,Y)$, show the equivalence between: existence of $S$ such that $S(T(x))=x$, and $T$ being injective with $T(X)$ complemented in $Y$
• 13 If every subsequence of $(x_n)$ has a subsequence converging weakly to $x$ then $x_n$ converges weakly to $x$.
• 10 Distances and speeds
• 9 Leibniz rule derivation
• 8 Extending an equality from a dense subspace - possible mistake in a proof.
• 8 Is L2 norm always smaller than L1 norm even in infinite dimensional space?
• 7 Examples of $(\mathcal K^\bot)^\bot=\mathcal K$ failing.
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