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A mathematical relationship expressing f_n as some combination of f_i with i<n. When formulated as an equation to be solved, recurrence relations are known as recurrence ...

A parallelogram in which angles are oblique and adjacent sides are of unequal length.

The solution u(x,y)=int_0^xdxiint_1^yR(xi,eta;x,y)f(xi,eta)deta, where R(x,y;xieta) is the Riemann function of the linear Goursat problem with characteristics phi=psi=0 ...

The method for solving the Goursat problem and Cauchy problem for linear hyperbolic partial differential equations using a Riemann function.

The divisibility test that an integer is divisible by 9 iff the sum of its digits is divisible by 9.

The Rutherford constant is a mathematical constant that arises in plasma physics and is defined by K_R = sqrt(2)int_(-1)^infty([R(x)]^2)/(S[x])dx (1) = 0.8227..., (2) where ...

A scalar is a one-component quantity that is invariant under rotations of the coordinate system.

The mathematical study of the scattering operator and Schrödinger equation.

A planar graph corresponding to polyhedra skeletons. The polyhedral graphs are special cases.

The mathematical object kappa which controls the rate of geodesic deviation.