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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
awarded  Convention
Mar
23
reviewed Leave Open Determine the Winding Numbers of the Chinese Unicom Symbol
Mar
22
reviewed Close $I^{j}/I^{j+1} \cong R/I$ for any ideal I in ring R.
Mar
22
reviewed Leave Open Bijection between open and closed interval
Mar
22
reviewed Leave Open Is this 5th root in the set of natural numbers?
Mar
21
reviewed Leave Open Intuitive explanation of the term manifold
Mar
21
reviewed Leave Open Is there an area of study regarding why certain mathematical definitions are useful?
Mar
21
reviewed Leave Open Find the sum of the series $\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{6}-\cdots$
Mar
21
revised Supremum vs. Maximum in the definition of the Lp norm
Fixed the placement of the conditions under sup, max; other minor tidying
Mar
21
reviewed Reviewed Can you help me find a fractal drawing program?
Mar
21
reviewed Leave Open Hamiltonian Graphs
Mar
21
answered What are the properties of the positive real numbers pair $(a,b)$ for which $a b \geq a + b$?
Mar
21
reviewed Leave Open Closed form of recurrence equation
Mar
20
reviewed Reviewed Notation for the direct sum and Kronecker sum of matrices