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A game for which each player has a different set of moves in any position. Every position in an impartial game has a nim-value.

The Parts graphs are a set of unit-distance graphs with chromatic number five derived by Jaan Parts in 2019-2020 (Parts 2020a). They provide some of the smallest known ...

A set P is called perfect if P=P^', where P^' is the derived set of P.

A braid in which strands are intertwined in the center and are free in "handles" on either side of the diagram.

A homogeneous polynomial in two or more variables.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

A prime field is a finite field GF(p) for p is prime.

The symbol p^e∥n means, for p a prime, that p^e|n, but p^(e+1)n.

A set class which is not a set.

Combine the two above squares on the left into the single large square on the right.