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Intereting Posts

When $\cos{n^{\circ}}$ can be expressed in real radicals?
Property of a polynomial with no positive real roots
Sequence Notation — Which brackets to use?
The center of a group is an abelian subgroup
Euler's Totient function $\forall n\ge3$, if $(\frac{\varphi(n)}{2}+1)\ \mid\ n\ $ then $\frac{\varphi(n)}{2}+1$ is prime
The complex version of the chain rule
Conditional Expectation of a Poisson Random Variable
Pointwise limit of a measurable function is still measurable, for weak star convergence measure
Proof of cardinality inequality: $m_1\le m_2$, $k_1\le k_2$ implies $k_1m_1\le k_2m_2$
Diophantine Equations : Solving $a^2+ b^2=2c^2$
A continuous function $f$ from a closed bounded interval $$ into $\mathbb{R}$ is uniformly continuous
Let $(x_n)\downarrow 0$ and $\sum x_n\to s$. Then $(n\cdot x_n)\to 0$
Am I allowed to use distributive law for infinitely many sets?
Prove $\sum_{i=1}^{n}\frac{a_{i}}{a_{i+1}}\ge\sum_{i=1}^{n}\frac{1-a_{i+1}}{1-a_{i}}$ if $a_{i}>0$ and $a_{1}+a_{2}+\cdots+a_{n}=1$
Preimage of generated $\sigma$-algebra