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If p>1, then Minkowski's integral inequality states that Similarly, if p>1 and a_k, b_k>0, then Minkowski's sum inequality states that [sum_(k=1)^n|a_k+b_k|^p]^(1/p) ...

A nonuniform rational B-spline surface of degree (p,q) is defined by ...

A 1-form omega=sum_(i=1)^na_i(x)dx_i such that omega=0.

The volume of a prismatoid is equal to the sum of the volumes of a pyramid, a wedge, and a parallelepiped.

The divisibility test that an integer is divisible by 9 iff the sum of its digits is divisible by 9.

Let a general theta function be defined as T(x,q)=sum_(n=-infty)^inftyx^nq^(n^2), then

The Sombor index of a graph is defined as half the sum of the matrix elements of its Sombor matrix.

For a discrete function f(n), the summatory function is defined by F(n)=sum_(k in D)^nf(k), where D is the domain of the function.

The sum of the angles of a triangle is two right angles. This postulate is equivalent to the parallel postulate.

The limit of an upper sum, when it exists, as the mesh size approaches 0.