And from that time I understood that if you have any fear of a great fire, you must run to it and work, and you will not fear at all.
Nikolai Gavrilovich Chernyshevskii

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What's Abelian?

A group is a set with an operation. Let's call this set A. Then, an abelian group has an operator (which we will label as ∙) such that for a,b, both elements in A, a ∙ b = b ∙ a. That is, the operation is commutative, or order doesn't matter. It's named after mathematician Niels Henrik Abel.