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 Apr 29 answered Fundamental set of solutions to a differential equation Apr 25 reviewed Approve Then there exists a unique natural number $b$ less than $p$ such that $ab \equiv 1 \pmod{p}$. Apr 25 awarded reference-request Apr 25 answered Does anyone know a book on sketching surfaces? Apr 22 comment Analytic solutions Gerald Teschl's ODE and Dynamical systems. On the author's webpage you can find legal free copy. Apr 20 awarded Yearling Apr 15 comment Find the eigenvalues and eigenfunctions for $y''+\lambda y=0$ where $y'(1)=0$ and $y'(2)=0$ No, there will no $y(x-1)$. Replace all my $y$ except for the last one with, say, $v$, such that $y(x)=y(s+1)=v(s)$. Apr 14 comment Mean time time until fixation in the Wright-Fisher model The first formula is incorrect. Apr 14 answered Find the eigenvalues and eigenfunctions for $y''+\lambda y=0$ where $y'(1)=0$ and $y'(2)=0$ Apr 13 comment What is the idea behind Green's function? What does it do? @qmd YEs, it does make sense. See the edit. Try your method to obtsain the same answer. My method is directly related with my explanation, but yours is much more general. Apr 13 revised What is the idea behind Green's function? What does it do? added 779 characters in body Apr 13 comment What is the idea behind Green's function? What does it do? @qmd What method were you taught to find Green's function? Apr 11 revised What is the idea behind Green's function? What does it do? added 546 characters in body Apr 11 answered What is the idea behind Green's function? What does it do? Mar 12 reviewed Approve $\exp(2)$ does not converge $2$-adically. Mar 9 reviewed Reject floor-function tag wiki Feb 29 comment Picard Theorem for functions which are locally Lipschitz - Sketch of proof Look up, e.g., in the book by Hartman, ODE. Feb 29 reviewed Approve How do you sketch the LHS and RHS on one pair of axes and then solve Feb 29 reviewed Reject Solve this recurrence relation via a first order partial differential equation? Feb 29 answered The Wronskian of vector valued functions vs. the Wronskian of real valued functions.