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Please undelete my answer to the question Is this proof correct for positive semidefinite matrices? The question had been closed as a duplicate to the older question Is it true that $A^2\succ B^2$ implies that $A\succ B$, but not the converse? and my answer was consequently deleted by a moderator. Although the central statements in both questions are the ...


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Why is $\sqrt{-1}$ the only imaginary number we define? was closed as a duplicate of Why don't we define "imaginary" numbers for every "impossibility"? and then deleted. It's not really a duplicate, though. The older question only mentions $x=x+1$ and $x=1/0$, while the newer question mentions $\log0$, $1/0$, and $(-1)!$ (that's factorial,...


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Undeleted (still closed), Deleted, Undeleted, Deleted again, Undeleted again... The question What are sufficient conditions for a number to be irrational or transcendental? was closed as a duplicate of Proving irrationality and then deleted (along with answers with scores of $+12,+7,+4,+4$). I suggest the newer question is not a duplicate of the older one. ...


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I am perplexed by the deletion of this question, and would recommend it for undeletion. (Full disclosure: I answered the question, which is what made me aware of its disappearance.) The question was flagged as "spam or offensive content," and the user (who, if I recall correctly, was a new contributor) has been removed, but the edit history shows ...


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