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Joel

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53
Calculating sum of consecutive powers of a number
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37
Is the set of real numbers a group under the operation of multiplication?
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35
Calculate 2000! (mod 2003)
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33
Why did Euler use e to represent complex numbers?
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32
Are the equations $2x - 2y = 11, x = y - 2$ unsolvable?
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27
Proof the Fibonacci numbers are not a polynomial.
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22
Show that $l^2$ is a Hilbert space
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17
Is there a function that can be subtracted from the sum of reciprocals of primes to make the series convergent
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16
Are "constrained linear least squares" and "quadratic programming" the same thing?
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15
Integrate $\int \frac{ e^{\tan^{-1}x}}{(1+x^2)^2} dx$
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13
How to calculate matrix raised to a high power.
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13
$\int \ln (\cos x)\,dx$
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11
e and its applications
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11
Show that the rank of $A+B$ is no more than the sum of the ranks of $A$ and $B$
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11
Give a concrete sequence of rationals which converges to an irrational number and vice versa.
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11
Reference request: approximation theory
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11
Does a periodic function have to be bounded?
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10
Hilbert vs Inner Product Space
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10
How to Prove the Semi-parametric Representer Theorem
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10
Prove that if the sum of each row of A equals s, then s is an eigenvalue of A.
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9
Limit of a geometric series
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9
Get rid of the square roots of the denominator: $\dfrac{1}{\sqrt{7}-2\sqrt{5}+\sqrt{3}}$
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9
Find $f(x)$ from the differential equation $f(x)+{f}'(x) = x^{3} +5x^{2} +x +2$
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9
How to tackle the depression and frustration regarding math?
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9
Solving $2^{2x+1} - 2^{x+4} = 2^3 - 2^x$
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9
Why ${n \choose k} = {n \choose n-k}$?
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8
Is the countable union of disjoint compact sets compact?
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8
Decomposition an operator in terms of symmetric and anti-symmetric components
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8
simplify and evaluate $\frac{\tan80^\circ-\tan20^\circ}{1+\tan80^\circ\tan20^\circ}$
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8
$f$ integrable but $f^2$ not integrable
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