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 Feb 16 awarded Excavator Feb 16 revised What exactly is Laplace transform? spelling of "Laplace" Feb 7 reviewed Approve Proving replacement theorem? Feb 7 answered Can a complex argument into this function ever yield a real result? Feb 7 reviewed Approve Range of the expression $n^n (\frac{n+1}{2})^{2n}$ Dec 5 comment How to write a proof of $A\setminus B = \emptyset \leftrightarrow A \subseteq B$ If $A\setminus B$ is empty, it would mean that when you took $B$ from $A$, all of $A$ disappeared. Could this happen if $A$ was not a subset of $B$? Dec 5 comment How to write a proof of $A\setminus B = \emptyset \leftrightarrow A \subseteq B$ You should show that $A \setminus B=\emptyset$ implies $A \subseteq B$ and then show that $A \subseteq B$ implies $A \setminus B = \emptyset$. Dec 5 revised Laurent Series for $\csc(z)$ added 1 character in body Nov 21 reviewed Approve Can I show $\sum_{i=1}^n 1/{i^2} \le 2$ without calculus? Oct 30 awarded Good Answer Oct 7 reviewed Approve When is $0$ ever used in real life? Sep 18 comment Monotone subsequences in a sequence of $n^2+1$ distinct real numbers Subsequences can skip elements Sep 17 awarded Nice Answer Sep 8 awarded Yearling Apr 12 awarded Custodian Mar 29 reviewed Approve Solve $(z+2) /( z-3i) = 4+2i$ for $z$ in complex numbers Mar 23 reviewed Approve About absolute value Mar 23 reviewed Approve Defining a Bounded linear functional Feb 27 awarded Custodian Sep 8 awarded Yearling