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A positive-height (outward-pointing) pyramid used in augmentation. The term was introduced by B. Grünbaum.

The elliptic lambda function lambda(tau) is a lambda-modular function defined on the upper half-plane by lambda(tau)=(theta_2^4(0,q))/(theta_3^4(0,q)), (1) where tau is the ...

A space endowed with a non-Euclidean elliptic geometry.

Johnson solid J_(20).

Johnson solid J_(40).

Johnson solid J_9.

Johnson solid J_(18).

Johnson solid J_7.

Of opposite symmetry under reflection; mirror images.

A 90-sided polygon.