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A partial differential equation whose solution does not depend continuously on its parameters (including but not limited to boundary conditions) is said to be ill-posed.

Three concurrent homologous lines pass respectively through three fixed points on the similitude circle which are known as the invariable points.

The ordinary differential equation y^('')+(1-|y|)y^'+y=0.

Let F be a differential field with constant field K. For f in F, suppose that the equation g^'=f (i.e., g=intf) has a solution g in G, where G is an elementary extension of F ...

For an arbitrary not identically constant polynomial, the zeros of its derivatives lie in the smallest convex polygon containing the zeros of the original polynomial.

A necessary and sufficient condition for all the eigenvalues of a real n×n matrix A to have negative real parts is that the equation A^(T)V+VA=-I has as a solution where V is ...

The dual of the inverted snub dodecadodecahedron U_(60) and Wenninger dual W_(114).

A quantity by which another (the multiplicand) is multiplied. For example, in the expression a×b, a is the multiplier. The result of the multiplication of two or more ...

Partial differential equation boundary conditions which give the normal derivative on a surface.

A nowhere-neat dissection in which squares of the same size are not allowed to share any part of a side.