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The map H_n(X,A)->H_(n-1)(A) appearing in the long exact sequence of a pair axiom.

The braced square problem asks, given a hinged square composed of four equal rods (indicated by the red lines above), how many more hinged rods must be added in the same ...

Solve the Pell equation x^2-92y^2=1 in integers. The smallest solution is x=1151, y=120.

"Brick" is an informal term for a cuboid.

Bonato et al. (2014, 2015) defined the burning number of a simple graph as follows. Consider a process called burning involving are discrete time steps. Each node is either ...

A determinant appearing in Padé approximant identities: C_(r/s)=|a_(r-s+1) a_(r-s+2) ... a_r; | | ... |; a_r a_(r+1) ... a_(r+s-1)|.

A puzzle in logic in which one or more facts must be inferred from a set of given facts.

The study of map projections and the making of geographical maps.

A Z-action or N-action. A cascade and a single map X->X are essentially the same, but the term "cascade" is preferred by many Russian authors.

A variable which belongs to exactly one of a finite number of categories.