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Fundamental Group of Torus (van Kampen method)

There are various methods of computing fundamental groups, for example one method using maximal trees of a simplicial complex (considered a slow method). There is one “trick” using van Kampen’s Theorem that makes it relatively fast to compute the fundamental group. 132 more words


Cheryl's birthday riddle

This riddle was given in the Singapore and Asian Math Schools Olympiad, and it managed to stump the internet. It is the twenty-fourth question out of twenty-five questions, so it is quite hard. 256 more words

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