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 Dec 24 awarded Yearling Dec 24 awarded Yearling Sep 30 awarded Explainer Sep 24 awarded Autobiographer Dec 25 comment On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?) I too have had difficulty getting any traction on new areas from sources such as Wikipedia, and moreover am frustrated to see areas I do know explained in ways that will not help a beginner. For an autodidact, sources of free online textbooks are valuable; reddit.com/r/mathbooks is one place to start. Dec 24 awarded Yearling Dec 14 comment $x$ values for $2x + |x| = 3 + |x+1|$ It is OK to leave work for the reader, but you need to state you have not completed the problem lest the OP think you have demonstrated a complete solution. Dec 13 comment Determinate a continuous function given a few coordinates. I also like rational polynomials for practical work. They keep the degree of the polynomial down so they are easier to invert, and often the singularity is outside the region of interest, or is a feature of the function you are fitting to. Dec 13 comment Determinate a continuous function given a few coordinates. Write a general polynomial of degree one less than the number of points, then create a system of n equations which are the polynomial evaluated at each point. Then solve the system of equations to get the polynomial coefficients. Dec 13 answered $x$ values for $2x + |x| = 3 + |x+1|$ Dec 10 answered Values of a, b, and c that the curve $y = ax^3 + 3x^2 + bx + cx + e^x$ has one point of inflection? Dec 10 comment Values of a, b, and c that the curve $y = ax^3 + 3x^2 + bx + cx + e^x$ has one point of inflection? Given that $e^x$ is positive will drive you to a negative x. Since it won't be too small you can probably use an estimate for $e^x$ around that x. Dec 4 answered Does every record of the arithmetic derivative of natural numbers occur at a practical number? Dec 4 awarded Custodian Dec 4 reviewed Reviewed Optimization Word Problem, revenue Dec 2 comment Does every record of the arithmetic derivative of natural numbers occur at a practical number? For a moment I thought they might be products of primorials (oeis.org/A025487) which is a tighter restriction, but 640 is the first one that is not. I'll have to keep thinking about it. Dec 2 answered Positively non-positive (from Brilliant.org) Whats wrong with my method? Nov 28 comment Trigonometry triangles Did you use c = - 17,500? I get two solutions, around F = 67 and F = - 260, which both work in the original equation. Nov 28 comment Can we determine which statements are incomplete due to Godel? Thanks for the clarification. Nov 28 accepted Can we determine which statements are incomplete due to Godel?