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 Dec 1 comment A formula that is upwards absolute but not downwards absolute Hey thanks for the answer. Sorry if this is a stupid question but what do you mean by $0^{\#}$ ? Dec 1 asked A formula that is upwards absolute but not downwards absolute Nov 22 comment Splitting field for $x^3+x+1$ Yeah I was not meaning $\mathbb{Z}_4$, i just used 0,1,2,3 to represent the elements of the field, which looking back would be some very misleading notation. Thanks Nov 22 accepted Splitting field for $x^3+x+1$ Nov 22 asked Splitting field for $x^3+x+1$ Nov 20 accepted Hilbert-Schmidt Operator Nov 20 asked Showing that the orthogonal projection in a Hilbert space is compact iff the subspace is finite dimensional Nov 19 asked Hilbert-Schmidt Operator Nov 7 revised Showing the basis of a Hilbert Space have the same cardinality deleted 7 characters in body Nov 7 comment Showing the basis of a Hilbert Space have the same cardinality @martini oh dear, just looked it over, I stopped halfway through and then continued on and used different notation by mistake, sorry . thanks for the comment Nov 7 revised Showing the basis of a Hilbert Space have the same cardinality edited body Nov 7 asked Showing the basis of a Hilbert Space have the same cardinality Nov 6 accepted Non-closed compact subspace of a non-hausdorff space Nov 6 comment Non-closed compact subspace of a non-hausdorff space Thanks for the help (I should have realised that any topology with finitley many open sets is compact- but I didn't and it was a helpful point, so thanks) Thanks for the second example too, it really helped Nov 6 asked Orthonormal Family in a Hilbert Space Nov 4 asked Non-closed compact subspace of a non-hausdorff space Oct 30 asked Showing that $\bigcap_{n=1}^{\infty}V_n\neq \emptyset$ Oct 30 comment Can one come to prove Cantor's theorem (existence of higher degree of infinities) FROM Russell's paradox? ZF is zermelo frankelen set theory. So just a suitable axiom system that does not allow us to define sets that are "too big" Oct 30 revised Can one come to prove Cantor's theorem (existence of higher degree of infinities) FROM Russell's paradox? added 1 characters in body Oct 30 answered Can one come to prove Cantor's theorem (existence of higher degree of infinities) FROM Russell's paradox?