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Convergence of series, sequences and functions and different modes of convergence.

6 votes
1 answer
459 views

A limit problem

Let $f$ be a bounded and continuous function, $0<a < 1$. $U(x,r)$ is the neighborhood of $x$ with diameter $r$. Can we prove the following equation of two limits $$ \lim_{r\rightarrow 0} \sup_{y,z \i …
Watheophy's user avatar
  • 419
1 vote
0 answers
78 views

$ \varlimsup_{x\rightarrow 0^+}\frac{f(x)}{x^a}=\varliminf_{x \rightarrow 0^+}\frac{f(x)}{x^...

$f(x)$ is continuous for $\forall x \geq 0$ and monotonically decrease. $f(0)=0$. $a>0$. Is it true $$ \varlimsup_{x\rightarrow 0^+}\frac{f(x)}{x^a}=\varliminf_{x \rightarrow 0^+}\frac{f(x)}{x^a} $$ …
Watheophy's user avatar
  • 419
1 vote
1 answer
53 views

Compare two limits related to Hölder condition

Suppose $f$ is a continuous function on $\mathbb{R}$. $0<a<1$. $B(x,r)$ is open ball centered at $x$ with radius $r$. Is it true that $$ \varlimsup_{r\rightarrow 0} \frac{|f(x+r)-f(x)|}{|r|^\alpha} \l …
Watheophy's user avatar
  • 419
0 votes
1 answer
106 views

A problem of the limit of $\frac{\sup_{0<\lvert y\rvert\leq \delta}\lvert f(x+y)-f(x)\rvert}...

Suppose that $f$ is a continuous function on $[0,1]$. For $0<a<1$, if $$ \varlimsup_{\delta \rightarrow 0} \frac{\sup_{0<\lvert y\rvert\leq \delta}\lvert f(x+y)-f(x)\rvert}{\delta^{a}} = \infty, $$ th …
Watheophy's user avatar
  • 419