19 Nobody told me that self teaching could be so damaging... 8 Verifying if system has periodic solutions 8 How $\frac{dx}{dy}=f(x)g(y) \Leftrightarrow \int \frac{dx}{f(x)} = \int g(y)dy$? 7 converting a differential equation to polar coordinates 5 Find all functions $f(x)$ satisfying $f(x)+f^{\prime}(\pi-x)=1$ for all $x \in \mathbb{R}$.

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### Questions (5)

 4 An inequality involving arctan of complex argument 2 On using Fourier transforms to solve the root of a convolution 2 On applying the Layer Cake Representation 1 On calculating spectral projections 1 Lower bounds of laplace transform of characteristic functions

### Tags (47)

 49 ordinary-differential-equations × 26 10 dynamical-systems × 3 19 advice 8 periodic-functions 19 self-learning 8 nonstandard-analysis 19 soft-question 8 infinitesimals 13 calculus × 4 7 polar-coordinates

### Bookmarks (6)

 28 Proving that the triangle inequality holds for a metric on $\mathbb{C}$ 21 The differential equation $y' = \frac{\ln(x^2+y^2)}{x^2 + y^2}$ 14 Fourth Order Nonlinear ODE 7 Making new sense of the three-body problem in the light of Maryam Mirzakhani math contributions 2 Classification of operators