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An Ore graph is a graph that satisfies Ore's theorem, i.e., a graph G for which the sums of the degrees of nonadjacent vertices is greater than or equal to the number of ...

A birotunda in which the bases are in the same orientation.

Coordinates defined by an orthocentric system.

A cupolarotunda in which the bases are in the same orientation.

Orthogonal contravariant and covariant satisfy g_(ik)g^(ij)=delta_k^j, where delta_j^k is the Kronecker delta.

The term "over" is commonly used in mathematical exposition as a synonym for "in the domain of." So, for example, "Let f be a function over the reals" means "Let f be a ...

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.