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21
How is Category Theory used to study differential equations?
math.stackexchange.com

14
What does it mean to multiply differentials?
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13
Evaluate $\int_{-\infty}^{\infty}\frac{\sin x}{x}\mathop{}\! \mathrm dx$
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13
What are some examples of when Mathematics 'accidentally' discovered something about the world?
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12
Is there any meaning to “I'm drowning in footwear!”?
scifi.stackexchange.com

11
Is there math with non-commutative multiplication of real numbers?
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8
If $1!+2!+\dots+x!$ is a perfect square, then the number of possible values of $x$ is?
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8
How do you deal with someone who's pushing you without explaining yourself?
interpersonal.stackexchange.com

7
Integrating linearly
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7
Prove $\sqrt{n}+\sqrt{n+k}$ is irrational
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7
If every absolutely convergent series is convergent then $X$ is Banach
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6
Proving an algebraic identity
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6
prove $RP^3\cong SO(3)$
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6
Prove $a^2+b^2+c^2 \ge a+b+c$ if $abc=1$, and $a$, $b$, $c$ are positive real numbers
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6
Is this an ellipse?
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6
Probably an easy question: $e^{2\ln(3)}$ without a calculator
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6
What is the role of conjectures in modern mathematics?
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6
What is the volume inside the event horizon of a black hole?
physics.stackexchange.com

5
Is there a female Predator?
scifi.stackexchange.com

5
Solving $f(yf(x)+x/y)=xyf(x^2+y^2)$ over the reals
math.stackexchange.com

5
If $a_n=\frac{1}{0!}+\frac{1}{1!}+\frac{1}{2!}+\dots+\frac{1}{n!}$, show that $2\le \lim_{n\to \infty} a_n\le 3$.
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5
How to prove $f(x)=\cos x$ is continuous on $\mathbb{R}$
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5
How to evaluate the integral$\int_0^1 \ln r \ln(1-r)$?
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5
Find all possible values of $ d_{17}$ knowing that $ (d_7)^2 + (d_{15})^2= (d_{16})^2$
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5
Find $xy+yz+zx$ given systems of three homogenous quadratic equations for $x, y, z$
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5
Differentiate functions
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5
How to calculate the pullback of a $k$-form explicitly
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5
Prove that the square of an integer $a$ is of the form $a^2=3k$, or $a^2=3k+1$, where $k\in \mathbb{Z} $
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5
Evaluate $\sqrt{1+2\sqrt{1+3\sqrt{1+4\sqrt{1+5\sqrt{1+…}}}}}$
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5
Solving $e^{e^z}=1$: am I missing something?
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