How many subsets of $\{1,2,3,\ldots,100\}$ contain all the even numbers?

What fields between the rationals and the reals allow to define the usual 2D distance?

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What is the Difference Between Formulating the Answer via Quadratic Formula and Factoring?

Prove that $\frac{1}{ab}+\frac{1}{cd} \geq \frac{a^2+b^2+c^2+d^2}{2}$

Can this expression be simplified? (double integral over a sphere in $\mathbb{R}^3$.

Algebraic de Rham Cohomology of Projective Space over $\mathbb{C}$

Multivariate Quadratic Regression

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How to prove this identity nicely?

What are the limitations of computer plotting?

Proving $(\bf x\times y\cdot N)\ z+(y\times z\cdot N)\ x+(z\times x \cdot N)\ y= 0$ when $\bf x,y,z$ are coplanar and $\bf N$ is a unit normal vector

Isometry and compactness.

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