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One of the Zermelo-Fraenkel axioms which asserts the existence for any set a of a set x such that, for any y of a, if there exists a z satisfying A(y,z), then such z exists ...

One of the Zermelo-Fraenkel axioms which asserts the existence of the empty set emptyset. The axiom may be stated symbolically as exists x forall y(!y in x).

The axiom of Zermelo-Fraenkel set theory which asserts the existence for any set a of the sum (union) x of all sets that are elements of a. The axiom may be stated ...

The Balthasart projection is a cylindrical equal-area projection that uses a standard parallel of phi_s=50 degrees.

A polyiamond consisting of equilateral triangles arranged along a line.

When working over a collection of fields, the base field is the intersection of the fields in the collection, i.e., the field contained in all other fields.

The set of points in the space of system variables such that initial conditions chosen in this set dynamically evolve to a particular attractor.

One basis point is defined to be 0.01 percentage points. Therefore, a change of 0.21% could also be expressed as a change by 21 "basis points."

A construction for the rhombic dodecahedron.

The 4-polyhex illustrated above.