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Mathematics
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SmileyCraft
  • Member for 9 years
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56
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24
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11
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42
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14
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41
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13
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16
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8
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39
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36
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10
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5
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Top posts

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36
Reverse engineering a math magic trick involving matrices.
Dec 22, 2018
32
Is there a bijective seacucumber?
Oct 18, 2018
22
A function $f:\mathbb{R}^2\to\mathbb{R}^2$ that is open and closed, but not continuous.
Jan 22, 2019
14
Prove or disprove: There is a way to choose independent random chords in a circle so that their intersections are uniformly distributed in the circle.
Nov 10, 2023
12
Show that there exist $[a,b]\subset [0,1]$, such that $\int_{a}^{b}f(x)dx$ = $\int_{a}^{b}g(x)dx$ = $\frac{1}{2}$
Dec 21, 2018
11
What are these diagonal lines for in this visual Collatz representation?
Mar 10
11
Possible areas of a triangle divided by 2 cevians into 4 regions of integer areas, values of $A+B+C+D$ if $C=\frac{(2A+B+D)BD}{A^2-BD}$
Dec 30, 2025
11
If derivative goes to $0$, does the function have a limit?
Dec 28, 2018
10
Is there a metric $d$ on $\mathbb{R}$ such that $\{d(x,y):x,y\in\mathbb{R}\}=[0,\infty)\cap\mathbb{Q}$?
Mar 30
10
Puzzle group of $4\times 4$ "flip" game
Dec 27, 2018

Top network posts

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7
One flip coin game
6
Index matching algorithm without hash-based data structures?
6
How to iteratively build a list?