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Mar
25
reviewed Close mod operation proof
Mar
25
reviewed Leave Open Use definitions to show $[0, 1) × [0, 1)$ is neither an open nor closed subset of $\Bbb{R^2}$.
Mar
25
reviewed Close why is integration the area under a curve
Mar
25
reviewed Leave Open Quantifier for “there is at most one”?
Mar
24
reviewed Looks OK Partial Fractions as Power Series
Mar
24
reviewed Leave Open For what $n$ does $[\log_21]+[\log_22]+[\log_23]+\dotsb+[\log_2n] = 1538$?
Mar
24
reviewed Leave Open Generalization of the Mobius inversion formula to Dedekind domains
Mar
24
reviewed Leave Open nonzero digits in decimal representation of $\sqrt{2}$
Mar
24
reviewed Reopen permutation & combinations
Mar
24
reviewed Close Number of ways to set 3 queens to attack each other
Mar
24
comment Number of ways to set 3 queens to attack each other
I'm not sure whether the problem statement is intended to be that each queen is attacked by at least one queen or by all other queens; and in the latter case, whether you intend to count "all in a straight line" as an exception.
Mar
24
reviewed Reject Sequences and series of $\tan^n x$
Mar
24
reviewed Leave Closed Home work of PDE
Mar
24
reviewed Close $A\subseteq B\to A\setminus B = \emptyset$. Is this true?
Mar
24
comment $A ⊂ B$ if and only if $A − B = ∅$
The statement is incorrect. Alberto's answer proves the correct statement (with $\subseteq$ instead of $\subset$), but for some reason doesn't point out this important difference.
Mar
24
reviewed Close Do all logic problems have one solution?
Mar
24
comment Do all logic problems have one solution?
The NAND operator also includes the case that neither of the operands is true. I think you're confusing it with XOR. But for the first issue, if you know what the problem is with your answer, and you know how to fix the problem, what's the question? And for the second issue, what do you mean? I can see two instances of $P(y)$ in that answer.
Mar
24
reviewed Close If $A$ is any matrix then $A^*A$ and $AA^*$ are Hermitian with non-negative eigenvalues
Mar
23
reviewed Close Convex Optimization: Advantages of Symmetric Primal-Dual Algorithms?
Mar
23
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