Form Envelope
Given a differential p-form q in the exterior algebra ^ ^pV^*, its envelope is the smallest subspace W such that q is in the subspace ^ ^pW^* subset ^ ^pV^*. Alternatively, W is spanned by the vectors that can be written as the tensor contraction of q with an element of ^ ^(p-1)V.
For example, the envelope of dx in V=R^2 is W=<partial/partialx>, and the envelope of dx_1 ^ dx_2+dx_3 ^ dx_4 in V=R^4 is all of V.
See also
Decomposable, Differential k-Form, Differential Ideal, Exterior Algebra, Vector Space, Wedge ProductThis entry contributed by Todd Rowland
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Rowland, Todd. "Form Envelope." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/FormEnvelope.html