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High Quality Content by WIKIPEDIA articles! In general relativity, a frame field (also called a tetrad or vierbein) is an orthonormal set of four vector fields, one timelike and three spacelike, defined on a Lorentzian manifold that is physically interpreted as a model of spacetime. The timelike unit vector field is often denoted by vec{e}_0 and the three spacelike unit vector fields by vec{e}_1, vec{e}_2, , vec{e}_3. All tensorial quantities defined on the manifold can be expressed using the frame field and its dual coframe field. Frames were introduced into general relativity by Hermann Weyl in 1929. ... Read more