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The unit lower half-disk is the portion of the complex plane satisfying {|z|<=1,I[z]<0}.

The second-order ordinary differential equation y^('')+alpha(x)y^'+x^2y^n=0.

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

The identities between the symmetric polynomials Pi_k(x_1,...,x_n) and the sums of kth powers of their variables S_k(x_1,...,x_n)=sum_(j=1)^nx_j^k. (1) The identities are ...

Two vectors u and v are parallel if their cross product is zero, i.e., uxv=0.

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

A distribution with kurtosis excess gamma_2<0, and therefore having a flattened shape.

A sequence {mu_n}_(n=0)^infty is positive definite if the moment of every nonnegative polynomial which is not identically zero is greater than zero (Widder 1941, p. 132). ...

An algebra in which the associator (x,x,x)=0. The subalgebra generated by one element is associative.

A proper fraction is a fraction p/q with p,q>0 such that p/q<1. A fraction p/q>1 is called an improper fraction.