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A set P is called perfect if P=P^', where P^' is the derived set of P.

A sum over all cluster perimeters.

A fractal process for which H>1/2, so r>0.

A heptomino in the shape of the Greek character pi.

A braid in which strands are intertwined in the center and are free in "handles" on either side of the diagram.

A distribution with kurtosis excess gamma_2<0, and therefore having a flattened shape.

The Betti numbers of a compact orientable n-manifold satisfy the relation b_i=b_(n-i).

The metric ds^2=(dx^2+dy^2)/((1-|z|^2)^2) of the Poincaré hyperbolic disk.

An estimator of the actual values of population.

The portion of the probability distribution which has a P-value equal to the observed P-value.