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A tree having an infinite number of branches and whose nodes are sequences generated by a set of rules.

A triacontahedron is a 30-faced polyhedron. Examples include the 14-gonal antiprism, biaugmented truncated cube (Johnson solid J_(67)), 15-gonal dipyramid, 28-gonal prism, ...

The trimean is defined to be TM=1/4(H_1+2M+H_2), where H_i are the hinges and M is the statistical median. Press et al. (1992) call this Tukey's trimean. It is an L-estimate.

The Tristan Edwards projection is a cylindrical equal-area projection which uses a standard parallel of phi_s=37.383 degrees.

Not decidable as a result of being neither formally provable nor unprovable.

A cube whose edge lengths are 1. The unit cube therefore has unit volume.

An operator U satisfying U^|U = 1 (1) UU^| = 1, (2) where U^| is the adjoint.

Involving one variable, as opposed to two (bivariate) or many (multivariate).

A fixed point for which the stability matrix has both eigenvalues positive, so lambda_1>lambda_2>0.

The depth of a vertex v in a rooted tree as the number of edges from v to the root vertex. A function to return the depth of a vertex v in a tree g may be implemented in a ...