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The nth-order Sierpiński tetrahedron graph is the connectivity graph of black triangles in the nth iteration of the tetrix fractal. The first three iterations are shown ...

The integral int_0^thetae^(-xsecphi)dphi.

The property intf(y)delta(x-y)dy=f(x) obeyed by the delta function delta(x).

A sigma-compact topological space is a topological space that is the union of countably many compact subsets.

A family composed of countably many discrete families.

A family composed of countably many locally finite families.

The signed deviation is defined by Deltau_i=(u_i-u^_), so the average deviation is Deltau^_=u_i-u^_^_=u_i^_-u^_=0.

A test for determining the probability that a given result could not have occurred by chance (its significance).

The 6-polyiamond illustrated above.

Two triangles are similar if their triples of vertex angles are the same.