Mathematics
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Kibble's user avatar
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Kibble
  • Member for 8 years, 1 month
  • Last seen more than 3 years ago
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10
$f \in C^2(\mathbb R)$ , $(f(x))^2 \le 1$ ; $(f'(x))^2+(f''(x))^2 \le 1 $ ; then is $(f(x))^2+(f'(x))^2 \le 1 $?
Jun 27, 2016
question
8
Almost-identity: $[\int_0^\infty{\rm d}x-\sum_{x=1}^\infty] \prod_{k=0}^N\text{sinc}\left(\frac{x}{2k+1}\right) = \frac{1}{2}$
Dec 22, 2015
answer
8
The number of bottles of beer one can buy with $10, after exchanging bottles and caps
Nov 4, 2015
answer
6
Proving that $\sqrt{a_1^2} +\cdots+ \sqrt{a_n^2} > \sqrt{a_1^2 +\cdots+a_n^2}$ using Pythagoras
Jan 6, 2016
answer
5
Is $f(x)=e^x$ the only solution to $f(f'(x))=f'(f(x))$?
Nov 16, 2015
answer
5
How do i evaluate this sum :$\sum _{m=1}^{\infty } \sum _{k=1}^{\infty } \frac{m(-1)^m(-1)^k\log(m+k)}{(m+k)^3}$?
Dec 25, 2015
answer
5
Laplace Transform of Dirac Delta function
Mar 9, 2016
answer
5
What functions do we need besides polynomials to describe any real as the root of some equation?
Dec 8, 2016
answer
4
Finding a dominating function
Nov 1, 2015
answer
3
Estimating an exponential sum $\sum_{n = 1}^x e^n/n$
Nov 15, 2015
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Why are simulated qubits less effective?

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