Michael E2
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 Mar 27 comment Prove that series $\sum_{n=1}^\infty \arcsin(\frac{1}{\sqrt n})$ diverges I think you misread my comment. It was meant as a criticism of this answer, not Bernard's, whose priority I thought I was defending. In hindsight, I might have said "more clearly" instead of "less obscurely" and not triggered your response. I still don't know whether $\sim_\infty$ means asymptotic at infinity (my first reading); or that the ratio approaches a positive limit, or that the ratio is bounded by positive numbers in a neighborhood of infinity (possible meanings of equivalent). Mar 26 comment Prove that series $\sum_{n=1}^\infty \arcsin(\frac{1}{\sqrt n})$ diverges @Did (1) I compared the clarity and did not say it was obscure. (2) While common notation & terminology may vary by country, someone asking a basic intro calc. question in the US is unlikely to understand Bernard's terminology and notation. I was attempting to point out to Vika the meaning of Bernard's answer. (Admittedly, it was presumptuous to assume Vika did not understand, but I saw Vika's comment here before the other.) (3) I was also pointing out to Solumilkyu that this answer duplicates Bernard's earlier answer, although this answer has more complete details. -- What's the big deal? Mar 26 comment Prove that series $\sum_{n=1}^\infty \arcsin(\frac{1}{\sqrt n})$ diverges @Vika This is the content of Bernard's answer, but expressed less obscurely. Mar 26 answered Shorter proof for the existence of $e$ where $de^x/dx=e^x$? Mar 4 comment Get the edge vectors from a parallelepiped volume A cube is a parallelepiped, a special kind. Given only the volume, there are infinitely many answers. Perhaps there are more constraints to be added to the question? Perhaps you are seeking a parametrization of all possible parallelepipeds with a given volume? (As you can see, I don't quite fully understand the question, as it is currently stated.) Mar 4 comment Get the edge vectors from a parallelepiped volume How about V^(1/3){1, 1, 1}? Mar 4 comment Get the edge vectors from a parallelepiped volume Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Take the tour! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! Jan 30 comment Calculations with an exponentially-weighted moving average I'm voting to close this question as off-topic because this question belongs on another site in the Stack Exchange network. It is not about using Mathematica. Jan 16 comment How does Mathematica calculate sin(Pi/5)? According to Goldstine, Ptolemy started with Sin[Pi/5] and Sin[Pi/3] when constructing his "table of chords," probably from Eu. XIII.10. Jan 4 awarded Nice Answer Dec 29 awarded Yearling Dec 28 answered What are some math books written in dialogue or story form, e.g., a teacher explaining to a student? Dec 28 comment What are some math books written in dialogue or story form, e.g., a teacher explaining to a student? Also Galileo's Discourses and Mathematical Demonstrations Relating to Two New Sciences is in a similar dialogue form. Dec 21 comment Algorithm for computing chances of 5 goals in a football match Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Take the tour! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! Dec 15 comment What’s the difference between Analytical and Numerical approaches to problems? For some reason, I'm irritated that convention has settled on "analytic" instead of "symbolic." "Numerical" usually indicates an approximate solution obtained by methods of numerical analysis. "Analytical" solutions are exact and obtained by methods of symbolic manipulation, derived using analysis. The methods of numerical analysis are themselves derived using (symbolic) analysis. "Analytical" really fails to convey the intended distinction for me, since both approaches seem analytical. Dec 14 answered Mathematics and literature Nov 3 comment Calculate the final output based on sales ratio and required material See mathematica.stackexchange.com/help/on-topic -- you may have asked the wrong forum. Nov 3 comment Calculate the final output based on sales ratio and required material Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Take the tour! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! Oct 11 comment How can I solve this spherical trigonometry problem? In V10.3, this might work TravelDistance[CityData[{"Manila", "Manila", "Philippines"}], CityData[{"Phnom Penh", "Cambodia"}]] / Quantity[400, "Knots"]. Sep 10 comment Algorithm for generating the power set of a Set @ciao The "algorithm" in Mathematica is Subsets[S]! :)