Repeating/"Periodic" Derivatives?
56827
Functions that are their Own nth Derivatives for Real $n$
89185
The notation for partial derivatives
21922
Elegant way of obtaining the envelope of oscillating function
16291
Discontinuous derivative.
15920
Derangements with repetitive numbers
122474
Inconsistency with partial derivatives as basis vectors?
108118
Poincaré-Bendixon show periodic solutions.
33489
|f| is periodic implies f is periodic
33628
Prove that $\sin(\sqrt x)$ not periodic
79822
Problems with partial derivatives.
24668
Repeated squaring method
139372
Octave / Matlab: Extend a vector making it repeat itself?
103285
Limit of a periodic function
109189
Periodicity of a triginometric function
54619
Expressing hourly temporal recurrence
105398
Physical intuition for higher order derivatives
158444
Is this periodic solution unique? (ODE)