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

6 votes

Pointwise convergence for continuous functions

There is sequence of continuous functions $f_{n}$ on the unit interval $[0,1]$ which converges to a function $f$ such that $f$ is discontinuous at rational points of $(0,1)$, a dense subset …
Ali Taghavi's user avatar
3 votes
1 answer
262 views

Rate of convergence of the Riemann zeta function and the Euler product formula

We consider the Euler product formula $$\sum_{n=1}^\infty \frac{1}{n^s}=\prod_p \frac{1}{1-p^{-s}}$$ I have two questions about this equality: 1)Does the rate of convergence of each side dep …
Ali Taghavi's user avatar
5 votes
2 answers
560 views

Geometry of Level sets of elliptic polynomials in two real variables

Updated: A polynomial $P(x,y)\in \mathbb{R}[x,y]$ is called an elliptic polynomial if its last homogeneous part does not vanish on $\mathbb{R}^2\setminus\{0\}$.The two answers to this post provide a …
Ali Taghavi's user avatar