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The scalar form of Laplace's equation is the partial differential equation del ^2psi=0, (1) where del ^2 is the Laplacian. Note that the operator del ^2 is commonly written ...

The Weierstrass substitution is the trigonometric substitution t=tan(theta/2) which transforms an integral of the form intf(costheta,sintheta)dtheta into one of the form ...

A logical system which possesses an explicitly stated set of axioms from which theorems can be derived.

A coordinate system which has a metric satisfying g_(ii)=-1 and partialg_(ij)/partialx_j=0.

A three-dimensional coordinate system in which the axes do not satisfy the right-hand rule.

Any linear system of point-groups on a curve with only ordinary singularities may be cut by adjoint curves.

A system of parameter chain complexes used for multiplication on differential graded algebras up to homotopy.

The Ree group R(q) is the automorphism group of a S(2,q+1,q^3+1) Steiner system.

A relational system is a structure R=(S,{P_i:i in I},{f_j:j in J}) consisting of a set S, a collection of relations P_i(i in I) on S, and a collection of functions f_j(j in ...

A three-dimensional coordinate system in which the axes satisfy the right-hand rule.