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Combinatorics! Especially algorithmic stuff.
Oh, is algorithmic complexity part of combinatorics, or am I missing the mark? I would love to hear more about the kind of combo you do!
Sometimes! Counting is combinatorics, occasionally counting the steps can be a quite interesting, combinatorial task. Other times combinatorics is about playing a game, like a rubix cube, and trying to find clever ways to win.
So, for me, lots of playing with abstract systems. Some code, some proofs, and a surprising amount of linear algebra.
Ohh, playing with abstract systems, sounds nice! Also who can forget linear algebra in any math >.>