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A pentagonal rotunda adjoined to a decagonal prism which is Johnson solid J_(21).

An n-gonal pyramid adjoined to an n-gonal prism.

Johnson solid J_(19).

Johnson solid J_(14).

The Elsasser function is defined by the integral E(y,u)=int_(-1/2)^(1/2)exp[-(2piyusinh(2piy))/(cosh(2piy)-cos(2pix))]dx. (1) Special values include E(0,u) = 1 (2) E(y,0) = ...

The second-order ordinary differential equation (x^2y^')^'+x^2y^n=0.

Two nonsuperimposable objects which are mirror images of each other are called enantiomers. The term enantiomer is synonymous with enantiomorph. For example, the letters b ...

An endogenous variable is an economic variable that is related to other economic variables and determines their equilibrium levels.

The problem of determining (or counting) the set of all solutions to a given problem.

Schubert's application of the conservation of number principle.