What is the name of the circle that is tangent to three mutually-tangent circles centered at the vertices of a triangle?

Origins of Differential Geometry and the Notion of Manifold

How to understand "tensor" in commutative algebra?

Is this inequality provable? $e^{\left(\pi^{e^{\pi^{.^{.^{.^{e^\pi}}}}}}\right)}\ge \pi^{\left(e^{\pi^{e^{.^{.^{.^{\pi^e}}}}}}\right)}$

How can I find the dimension of the eigenspace?

Fractal dimension of the function $f(x)=\sum_{n=1}^{\infty}\frac{\mathrm{sign}\left(\sin(nx)\right)}{n}$

Where do you see cyclic quadrilaterals in real life?

Find all even numbers that can be represented as a difference of squares in only two ways

Density of primes among the prime powers

Reflection relating two subspaces

Why is$\int_{-\pi }^{\pi }(\sin nx)^2dx=\int_{-\pi}^{\pi}(\cos nx)^2dx=\pi$?

Find the probability of getting two sixes in $5$ throws of a die.

what is sine of a real number

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