Javier
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 Aug 6 comment Are parallel vectors always scalar multiple of each others? @AmitTomar: So really any lines that don't intersect? Because that's not the definition of parallel. Aug 6 comment Are parallel vectors always scalar multiple of each others? Could you clarify what you mean by parallel lines that are not in the same direction? Do you mean parallel lines that don't touch, or do you mean lines that have different direction vectors and don't intersect? The latter are called skew lines. Aug 6 comment Are parallel vectors always scalar multiple of each others? @Kaster: I think I may be misunderstanding the OP's question. Let me ask. Aug 6 comment Are parallel vectors always scalar multiple of each others? @user142526: I din't word that very well. Let me fix it. Aug 5 comment Explain this step in logarithms Your answer seems fine. Aug 3 comment Trying to reverse an equation and solve for a different variable Well, technically you can't reverse it, since because of the floor function many different xps will give the same level. But you can find out the minimum xp required to reach each level (I'm assuming this is for a game). Jul 31 comment Prove: $\int_0^{\infty}\left(\frac{\sin x}{x}\right)^2dx=\pi/2$ Presumably you mean $|x| \le \delta$ instead of $x \le |\delta|$ in the definition of $f$? Jul 27 comment Dot Product/ Cross Product Proof You're using the same $\theta$ for everything. That's not correct. Jul 21 comment How can the graph of a complex function be embedded in three dimensional space? @JoeHobbit: What do you mean? Could you give an example? Jul 18 comment is this the right truth table? Small nitpick: the fifth row is correct too. Jul 14 comment Unique root to a function Words?${}{}{}{}{}{}$ Jul 9 comment Evaluate $\int \limits_{0}^{\infty} \frac{x}{1+x^2} dx$ If you could overcome lack of convergence, no one would bother with convergence tests. Jul 8 comment Incorrect notation in math? Isn't it $-3/2$ in the exponent? Jul 8 comment Incorrect notation in math? All those notation are correct, if a bit confusing. But there exist incorrect notations, of course. Jul 7 comment Complex integral $\frac {1}{1+z}$ I'm not sure I understand what path you're supposed to integrate on. Jul 4 comment Proving the Product Rule for exponents with the same base How do you define this when $b$ and $c$ are not rational? Jul 3 comment derivative of $f(x)=\frac{x}{x-1}$ Do you know how to use the quotient rule? What are you having trouble with specifically? Jul 1 comment Evaluation of $\sum_{n=1}^{\infty}\frac{2n-1}{2^n}$ That was meant for the asker, by the way. Jul 1 comment Evaluation of $\sum_{n=1}^{\infty}\frac{2n-1}{2^n}$ Also don't forget that these formulas work when $n \ge 0$, but the series in the question has $n \ge 1$. Jun 30 comment Confusion regarding change of variables in ODEs It seems I just can't write comments today. I meant $g(x) = y(x+\pi)$.