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advent calendar 2021

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Plus Advent Calendar Door #24: An enormous theorem
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Plus Advent Calendar Door #23: New perspectives in symmetry
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Plus Advent Calendar Door #22: The maths of shuffling
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Plus Advent Calendar Door #21: The magic of shuffling
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Plus Advent Calendar Door #20: Cyclic groups
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Plus Advent Calendar Door #19: Groups
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Plus Advent Calendar Door #18: Happy birthday Quicksort!
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Plus Advent Calendar Door #16: Euler's formula
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Plus Advent Calendar Door #17: Complex square roots
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Plus Advent Calendar Door #15: Complex numbers
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Plus Advent Calendar Door #14: Opening the black box
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Plus Advent Calendar Door #13: Gradient descent algorithms
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