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An "area" which can be defined for every set--even those without a true geometric area--which is rigid and finitely additive.

Given a set X, a set function mu^*:2^X->[0,infty] is said to be an outer measure provided that mu^*(emptyset)=0 and that mu^* is countably monotone, where emptyset is the ...

An endomorphism is called ergodic if it is true that T^(-1)A=A implies m(A)=0 or 1, where T^(-1)A={x in X:T(x) in A}. Examples of ergodic endomorphisms include the map X->2x ...

Define the Euler measure of a polyhedral set as the Euler integral of its indicator function. It is easy to show by induction that the Euler measure of a closed bounded ...

A set of points capable of being enclosed in intervals whose total length is arbitrarily small.

A Boolean sigma-algebra which possesses a measure.

product_(i)dp_idq_i, where p_i and q_i are momenta and positions of particles.

A measure for which the q-dimension D_q varies with q.

mu_i(epsilon), sometimes denoted P_i(epsilon), is the probability that element i is populated, normalized such that sum_(i=1)^Nmu_i(epsilon)=1.

The probability law on the space of continuous functions g with g(0)=0, induced by the Wiener process.