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An even perfect number is perfect number that is even, i.e., an even number n whose sum of divisors (including n itself) equals n. All known perfect numbers are even, and ...

An exmedian is a parallel to a side of a triangle through the opposite vertex. So in the above diagram, A_2^'A_3^' is the exmedian of side A_2A_3, and so on. The pairwise ...

The curve y=1-e^(ax), illustrated above.

A type of dimension which can be used to characterize fat fractals.

The inverse curve of Fermat's spiral with the origin taken as the inversion center is the lituus.

An alternative name for an associated Legendre polynomial.

The statistical index P_B=sqrt(P_LP_P), where P_L is Laspeyres' index and P_P is Paasche's index.

If a sequence of double points is passed as a closed curve is traversed, each double point appears once in an even place and once in an odd place.

An arrangement of points with no three collinear, or of lines with no three concurrent.

The proposition that every consistent generalized theory has a model. The theorem is true if the axiom of choice is assumed.