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The polynomials in the diagonal of the Smith normal form or rational canonical form of a matrix are called its invariant factors.

A p-form alpha is indecomposable if it cannot be written as the wedge product of one-forms alpha=beta_1 ^ ... ^ beta_p. A p-form that can be written as such a product is ...

A system of variables which can be written in the form of Hamilton's equations.

A real-linear vector space H equipped with a symplectic form s.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

Erdős proved that there exist at least one prime of the form 4k+1 and at least one prime of the form 4k+3 between n and 2n for all n>6.

A second-order ordinary differential equation of the form

An ordinary differential equation of order n is an equation of the form F(x,y,y^',...,y^((n)))=0.

The dual vector space to a real vector space V is the vector space of linear functions f:V->R, denoted V^*. In the dual of a complex vector space, the linear functions take ...

Diagonalize a form over the rationals to diag[p^a·A,p^b·B,...], where all the entries are integers and A, B, ... are relatively prime to p. Then the p-signature of the form ...