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

An affine isoperimetric inequality.

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.

Plouffe's constants are numbers arising in summations of series related to r_n=f(2^n) where f is a trigonometric function. Define the Iverson bracket function rho(x)={1 for ...

For s_1,s_2=+/-1, lim_(epsilon_1->0; epsilon_2->0)1/(x_1-is_1epsilon_1)1/(x_2-is_2epsilon_2) =[PV(1/(x_1))+ipis_1delta(x_1)][PV(1/(x_2))+ipis_2delta(x_2)] ...

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.