Jul12 accepted Differentiating $\frac{te^{\tan t}}{ln(3t+1)}$? May31 accepted Why to see that $\overline{B}(x;r)$ is closed if it was just defined? May28 accepted On the thought process for choosing $\epsilon$'s to check the convergence of $(-1)^n$? May19 accepted $\mathcal{B}=\{v_1,v_2,v_3\}$ is an orthonormal basis, find all the vectors $v\in \mathbb{R}^3$ such that $\langle v, v_1+v_2-v_3\rangle=0$. Apr11 accepted Why $¬¬\bot \not\in PROP$? Apr7 accepted Where is this formula for generating pythagorean triples coming from? Mar24 accepted How can I simplify this boolean equation for the multiplexer a little further? Mar10 accepted Is there a name for this kind of function? Mar10 accepted How to obtain all the rational numbers without repetitions? Mar10 accepted Is it true that there is no algorithm to approximate the least upper bound? Feb9 accepted Why can't I obtain values of Sine/Cosine with $f(x)=\sqrt{1-x^2}?$ Jan26 accepted What's the right moment to learn Set Theory? Jan26 accepted Is there a proof of the irrationality of $\sqrt{2}$ that involves modular arithmetic? Jan26 accepted Since the conception of Set Theory, was Russell's Set the only problematic set found? Jan26 accepted Misconceptions about Cantor's diagonal argument? Jan26 accepted What's the successor of $\emptyset$? Do we need to assume that $\emptyset \in \emptyset$ for the successor to exist? Jan26 accepted Doubts on the axiom of union? Jan24 accepted $(X \supset A)\wedge (X \supset B)|(Y\supset A) \wedge (Y \supset B)\to Y\supset X$|Prove that $X=A \cup B$. Jan4 accepted What's the name/purpose of this process, precisely? Jan4 accepted What's the proof that the sum and multiplication of natural numbers is a natural number?