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A nonzero ring S whose only (two-sided) ideals are S itself and zero. Every commutative simple ring is a field. Every simple ring is a prime ring.

Assemble six 1×2×2 blocks and three 1×1×1 blocks into a 3×3×3 cube.

The dual polyhedron of the small icosihemidodecahedron U_(49) and Wenninger dual W_(89). When rendered, the small icosihemidodecacron and small dodecahemidodecacron appear ...

The exploration of three-dimensional space from two-dimensional sections of projections of solid bodies.

The tangential mid-arc circle is the circumcircle of the tangential mid-arc triangle. Its center and radius appear to be very complicated functions. Its center is not in ...

The term "twisted sphere" is used to mean either a projective plane (Henle 1994, p. 110) or the corkscrew surface obtained by extending a sphere along a diameter and then ...

Let (K,|·|) be a non-Archimedean field. Its valuation ring R is defined to be R={x in K:|x|<=1}. The valuation ring has maximal ideal M={x in K:|x|<1}, and the field R/M is ...

Every odd integer n is a prime or the sum of three primes. This problem is closely related to Vinogradov's theorem.

If two curves of the same curve genus >1 are in rational correspondence, then that correspondence is birational.

The width of a box is the horizontal distance from side to side (usually defined to be greater than the depth, the horizontal distance from front to back).