If the minus of two periodic function tends to zero can prove they are equal?
64134
The difference between two periodic functions converges to zero, is this two functions identical?
57938
When do two functions become equal?
76347
Shorter proof for some equvalences
126698
measurability of a function -equivalent conditions
35754
Is $f(x)=\sin(x^2)$ periodic?
17646
If $\frac{f(x)}{x}$ is decreasing in $(0,\infty)$, prove that $f(a+b) \leq f(a) + f(b)$ for $a,b >0$
35071
Periodic polynomial?
144601
Given $f(x+T) = f(x) + a$, prove that $f(x) = \varphi(x) + {a \over T}x$, where $\varphi(x)$ is periodic with period $T$
6772
How to prove that if the one sided limits are equal the general limit is that value?
108929
Proving the limit of a function of a sequence is equal to the function of the limit of that sequence
20863
how do I prove this inequallity?
91744
Proving sum of sines is periodic when ratio of their frequencies is rational using differentation
8913
Show that there is $\xi$ s.t. $f(\xi)=f\left(\xi+\frac{1}{n}\right)$
66951
Proving the existence of a sequence of functions converging to 0 with an added property
43547
If a function is convergent and periodic, then it is the constant function.
7878
Proving that a doubly-periodic entire function $f$ is constant.
152701
A question on periodicity of complex functions