Tensors

Two-vector

A two-vector or bivector is a tensor of type and it is the dual of a two-form, meaning that it is a linear functional which maps two-forms to the real numbers (or more generally, to scalars). The tensor product of a pair of vectors is a two-vector. Then, any two-form can be expressed as a linear combination of tensor products of pairs of vectors, especially a linear combination of tensor products of pairs of basis vectors. If f is a two-vector, then where the f α β are the components of the two-vector. Notice that both indices of the components are contravariant. This is always the case for two-vectors, by definition. A bivector may operate on a one-form, yielding a vector: , although a problem might be which of the upper indices of the bivector to contract with. (This problem does not arise with mixed tensors because only one of such tensor's indices is upper.) However, if the bivector is symmetric then the choice of index to contract with is indifferent. An example of a bivector is the stress–energy tensor. Another one is the orthogonal complement of the metric tensor. (Wikipedia).

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From playlist Vectors

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This video explains how to determine if vectors are parallel. http://mathispower4u.yolasite.com/

From playlist Vectors

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Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Systems of Equations with Elimination Two Variables Two Equations Example 2

From playlist Systems of Equations

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From playlist One-to-One and Onto Transformations

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Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Systems of Equations with Elimination Two Variables Two Equations Example 1

From playlist Systems of Equations

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From playlist Introduction to Vectors

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From playlist Discrete Differential Geometry - CMU 15-458/858

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From playlist QED- Prerequisite Topics

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From playlist Vector Math Lessons

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Related pages

Two-point tensor | Metric tensor | Abstract algebra | Symmetric tensor | Covariance and contravariance of vectors | Dual space | Tensor product | Dyadics | Stress–energy tensor | Tensor | Bivector