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

A method for constructing magic squares of odd order.

The straight polyomino of order n is the n-polyomino in which all squares are placed along a line.

The second-order ordinary differential equation y^('')=y^(3/2)x^(-1/2).

Every dense linear order complete set without endpoints having at most omega disjoint intervals is order isomorphic to the continuum of real numbers, where omega is the set ...

If a subset S of the elements of a field F satisfies the field axioms with the same operations of F, then S is called a subfield of F. In a finite field of field order p^n, ...

The most general form of Lagrange's group theorem, also known as Lagrange's lemma, states that for a group G, a subgroup H of G, and a subgroup K of H, (G:K)=(G:H)(H:K), ...

An algorithm for determining the order of an elliptic curve E/F_p over the finite field F_p.

Let (A,<=) and (B,<=) be disjoint totally ordered sets with order types alpha and beta. Then the ordinal sum is defined at set (C=A union B,<=) where, if c_1 and c_2 are both ...

An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).