### Questions (10)

 2 Why a classical solution of the wave equation has to be $C^2$? 2 Global solutions for Cauchy problem 2 The general solution of $y'=\vert y-t\vert$ 1 Who said: The shortest trajectory between two realities is complex? 0 Functions series and differentiability

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 2 Determining the first $3$ nonzero terms in each of two linearly independent solutions 2 Why does a solution of a linear homogenous ODE with constant coefficient must be infinitely differentiable? 1 How to make Laguerre's equation into Sturm-Liouville form 1 I am trying to solve the following first order linear inhomogeneous ODE. $a'_n(t) + 4\pi ^2 n^2 a_n = \frac{2}{n\pi}\left[ t(-1)^n-1\right]$ 1 Triangle inequality and reverse triangle inequality problem

### Tags (18)

 7 ordinary-differential-equations × 11 1 functional-analysis 2 sequences-and-series × 3 1 vector-spaces 2 proof-explanation × 2 0 calculus × 3 1 absolute-value 0 real-analysis × 3 1 sturm-liouville 0 pde × 2

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 Mathematics 221 rep 33 silver badges1010 bronze badges TeX - LaTeX 1 rep