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 Mar 7 awarded Popular Question Mar 4 awarded Popular Question Nov 2 awarded Famous Question Apr 17 awarded Notable Question Mar 7 awarded Popular Question Feb 16 awarded Popular Question Nov 22 accepted Does the presence of irrational numbers pose any problems for the concepts of limits and continuity? Nov 21 asked Does the presence of irrational numbers pose any problems for the concepts of limits and continuity? Nov 11 awarded Notable Question Sep 24 awarded Autobiographer Sep 8 awarded Popular Question Aug 2 awarded Notable Question Jul 2 awarded Curious Jul 2 awarded Yearling Apr 12 accepted Differential equation by series solution method: equating coefficients to zero Apr 12 comment Differential equation by series solution method: equating coefficients to zero I think I got it. n=1,2,3.. and upwards already invoke n=0, which is set to 0. In other words, $2a_2$ is the coefficient of $x^0$, and we have to set coefficients of all powers of $x$ equal to zero. Apr 12 asked Differential equation by series solution method: equating coefficients to zero Apr 12 revised What is the significance of finding the series solution of a differential equation “about a point”? Added edit Apr 12 asked What is the significance of finding the series solution of a differential equation “about a point”? Apr 6 asked What is the most general way to solve a linear, second-order ODE with variable coefficients?