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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.

Eliminate each knot crossing by connecting each of the strands coming into the crossing to the adjacent strand leaving the crossing. The resulting strands no longer cross but ...