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Mathematics
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CopyPasteIt
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15
How can I calculate $\alpha=\arccos\left(-\frac{1}{4}\right)$ without using a calculator?
Nov 23, 2017
13
Unexpected examples of natural logarithm
Jul 3, 2017
11
Proof of triangle inequality
May 14, 2017
10
Cardinality of the Cartesian Product of Two Equinumerous Infinite Sets
Oct 9, 2017
9
Rudin's proof on the uniqueness of a power root
Jun 10, 2018
8
Do complex numbers really exist?
Jul 7, 2017
7
What is the status of the Axiom of limitation of size? (adrift for almost a century now)
Jan 15, 2019
7
What is really the purpose of $i$?
Nov 13, 2017
7
Why is the associative property valid for modular arithmetic?
Feb 29, 2020
7
What are some mathematically interesting computations involving matrices?
Aug 28, 2017
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XOR-ing and Summing Two Black and White Images
5
Decoding encoded Google News URLs