Javier
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 Jul 2 awarded Curious Jul 2 awarded Inquisitive Jun 16 comment Using dimensional analysis to evaluate $\frac{d}{dx}x^n$ @tpb261: I feel like the issue here, this being a man site and all, is showing that you can't make a non-constant dimensionless function out of only $x$. For all we know, there might be a constant $a$ with dimensions of length such that $c =x/a$. Jun 16 comment I can't quite figure out this “separable equation” Small correction: having $\ln x$ in the equation already tells us that $x \neq 0$. Instead, you should assume that $x \neq 1$ so $\ln x \neq 0$. Jun 16 comment Using dimensional analysis to evaluate $\frac{d}{dx}x^n$ I'm wondering if this would be a better fit at Physics, or if they would tell you that it's obviously correct. Jun 13 reviewed Approve Multiplicative inverse of $0$ Jun 7 comment How to explain the perpendicularity of two lines to a High School student? The question is about how to explain the fact that the product of the slopes is $-1$. Jun 7 comment How to explain the perpendicularity of two lines to a High School student? I think you should read the question a little more. A high school student doesn't need real life examples to understand what "perpendicular" is. May 10 answered ∇×F (Curl) of a function of 4 variables? Apr 27 comment Have you encountered this integral? I think you mean $P$ is the transform of $f$. Apr 24 accepted Taylor expansion of a not easily differentiable function Apr 23 answered Let $\int_a^bf(x)sgn(f(x)) + 2f(x) \ dx = 0$. Show that $f$ has at least one root. Apr 23 comment Taylor expansion of a not easily differentiable function @Fred: Taylor series around where? The function doesn't work for $x\le 1$, that's the problem. Apr 20 asked Taylor expansion of a not easily differentiable function Apr 13 comment Difficult Improper Integral What's so terrible about $\frac{114}{19}$? Apr 6 revised How do I solve this indeterminate limit without the L'hospital rule? latex Mar 30 awarded Quorum Mar 29 reviewed Approve About $\lim_{x\rightarrow 0}\frac {\sin x}{x} = 1$ Mar 13 reviewed Approve $SO(n)$ is connected Mar 12 reviewed Approve Should an undergrad accept that some things don't make sense, or study the foundation of mathematics to resolve this?