Mathematics
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hdighfan
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All Questions Answers
Score Newest
answer
37
Why this approximation for $\pi$ is so accurate?
Jun 5, 2020
answer
23
Can we represent an improper integral as $\int_{-\infty}^{\infty} f(x)\,dx = \lim_{a \to \infty} \int_{-a}^a f(x)\,dx$?
Jun 4, 2020
answer
11
Show that $p(x)=2x^6+12x^5+30x^4+60x^3+8x^2+30x+45$ has no real roots
Jun 6, 2020
answer
8
In the described game, can the rubies be divided into 105 piles of one?
Jun 5, 2020
answer
7
Determining all $f : \mathbb R^+ \to \mathbb R^+$ that satisfy $f(x + y) = f\left(x^2 + y^2\right)$
Jun 8, 2020
answer
6
Size of quotient groups
Jun 7, 2020
answer
6
$\int\limits_{-1}^1 f' ^ 2\leq \frac{1}{2} \left( \int\limits_{-1} ^ 1 f^2 + \int\limits_{-1}^ 1 (f'')^2 \right) $
Jun 8, 2020
answer
6
Is the supremum of a continuous function bounded?
Jun 11, 2020
answer
5
If $G$ is a group with $|G|\ge2$ and has no subgroups except the two trivial ones, then $G$ is cyclic and of prime order.
Jun 7, 2020
answer
5
Simplification of ${0 \binom{n}{0} + 2 \binom{n}{2} + 4 \binom{n}{4} + 6 \binom{n}{6} + \cdots}$
Jun 11, 2020

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