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The dihedral group D_2 is a point group that is isomorphic to the vierergruppe and the finite group C_2×C_2.

If (f,U) and (g,V) are functions elements, then (g,V) is a direct analytic continuation of (f,U) if U intersection V!=emptyset and f and g are equal on U intersection V.

The term in logic used to describe the operation commonly known as OR. A literal is considered a (degenerate) disjunction (Mendelson 1997, p. 30). The Wolfram Language ...

The system of partial differential equations u_t = (u^2-u_x+2v)_x (1) v_y = (2uv+v_x)_x. (2)

A dodecagon is a 12-sided polygon. Several special types of dodecagons are illustrated above. In particular, a dodecagon with vertices equally spaced around a circle and with ...

The symbol | which is not used very commonly in mathematics. The double dagger is also known as the double obelisk or diesis (Bringhurst 1997, p. 275).

An endogenous variable is an economic variable that is related to other economic variables and determines their equilibrium levels.

A singular point a for which f(z)(z-a)^n is not differentiable for any integer n>0.

A more common way to describe a Euclidean ring.

The partial differential equation u_(xy)+(alphau_x-betau_y)/(x-y)=0.