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 Apr2 asked How to show that $\frac{-1}{x^2}=0$ has no solutions? Apr2 accepted Are there two meanings to induction? Apr2 comment Are there two meanings to induction? Very good. Your answer is the first thing that made the proof tick in my mind. You've made all steps really clear, I am satisfied. Thanks a lot! Apr2 asked A question on the proof of commutativity of the sum of natural numbers? Apr1 comment Are there two meanings to induction? I don't know, but I feel that part a little artificial. But perhaps it's only my own stupidity. Apr1 comment Are there two meanings to induction? Exactly! But the hypothesis is made out of nowhere. It is not a consequence of what was written before. Or if it is, then I really do not see how that could be. Apr1 revised Are there two meanings to induction? added 3 characters in body Apr1 asked Are there two meanings to induction? Mar26 comment Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? @N.F.Taussig I figured it now! Thanks. Mar26 answered Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? Mar25 comment Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? I don't know, I'm a bit confused with the book instructions. It says that the polar coordinates are $(R, \theta)$ and the cartesian coordinates of this point are $(R \cos \theta, R \sin \theta)$. I'm a bit confused. Mar25 asked Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? Mar24 awarded Popular Question Mar23 asked The triangle $ABC$ with points $A=(-a,0)$; $B=(a,0)$ $C=(0,y)$ is equilateral. What are the possible values of $y$? Mar21 revised Suplement books for calculus course? added 352 characters in body Mar20 revised Suplement books for calculus course? added 131 characters in body Mar16 comment Help on Apostol's explanation of Archimedes method? @neuguy For example, why start with $(k+1)^3$? I'm not really sure of what is happening in there, then I asked it vaguely: I was hoping that someone could rephrase it adding a little bit more detail perhaps? Mar16 asked Help on Apostol's explanation of Archimedes method? Mar16 revised Suplement books for calculus course? added 74 characters in body Mar15 asked Suplement books for calculus course?