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A method for constructing magic squares of odd order.

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

The Reye graph is the transposition graph G_4 of order 4.

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

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).

Let the absolute frequencies of occurrence of an event in a number of class intervals be denoted f_1, f_2, .... The cumulative frequency corresponding to the upper boundary ...

Let F_n be the nth Fibonacci number. Then the sequence {F_n}_(n=2)^infty={1,2,3,5,8,...} is complete, even if one is restricted to subsequences in which no two consecutive ...

For a quadratic form Q in the canonical form Q=y_1^2+y_2^2+...+y_p^2-y_(p+1)^2-y_(p+2)^2-...-y_r^2, the rank is the total number r of square terms (both positive and ...

A function with k continuous derivatives is called a C^k function. In order to specify a C^k function on a domain X, the notation C^k(X) is used. The most common C^k space is ...