Ataraxia
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 9 What's the difference between $\mathbb{R}^2$ and the complex plane? 9 Closest point in $y = \sqrt{x}$ to the origin is at $x=-1/2$? 8 How to solve the definite integral $\int_{-4}^{-2}e^{-x}\,dx$? 8 Is this still considered $\{0\}$ 8 How many functions $f:\{1,2,3,4\}→\{1,2,3,4\}$ satisfy $f(1)=f(4)$?

### Reputation (4,264)

 +10 How many functions $f:\{1,2,3,4\}→\{1,2,3,4\}$ satisfy $f(1)=f(4)$? +10 Find triple integral over a tetrahedron constructed by 3 planes +10 Closest point in $y = \sqrt{x}$ to the origin is at $x=-1/2$? +10 Sine and Cosine Models

### Questions (42)

 9 Why is the supremum of the empty set $-\infty$ and the infimum $\infty$? [duplicate] 6 Why is the 2 norm “special”? [duplicate] 6 bijection between $\mathbb{N}$ and $\mathbb{N}\times\mathbb{N}$ [duplicate] 5 Confusion about the usage of points vs. vectors 5 Are there eigenvectors, eigenvalues, and characteristic functions for non-linear vector fields?

### Tags (130)

 49 calculus × 31 23 combinatorics × 16 41 algebra-precalculus × 18 20 multivariable-calculus × 28 32 linear-algebra × 23 15 logic × 10 27 integration × 29 13 geometry × 6 24 functions × 10 12 complex-numbers × 6

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