# Mechanics and Arbitrary Vectors

Show that:

a. Sum of vectors i and j: epsilon(ijk)delta(ij) =0

b. Sum of vectors j,k: epsilon(ijk)epsilon(njk) = 2delta (in)

c Sum of vectors i,j,k: epsilon(ijk)epsilon(ijk) = 6

Show that:

Sum of vectors k: epsilon (jk)epsilon (mnk) = delta(im)delta (jn) - delta (in)delta (jm)

Using the epsilon (ijk) notation and in full explicit detail derive:

(AxB) . (CxD) = (A . C) (B . D) - (A.D)(B.C)

Let A be an arbitrary vector and let e be a unit vector in some fixed direction. Show that:

A = e (A.e) + ex (A x e)

https://brainmass.com/physics/classical-mechanics/mechanics-arbitrary-vectors-93606

#### Solution Summary

This handwritten solution contains step-by-step vector calculations to prove the vector sum statements in the question set. Brief explanations are included, and all formulas are clearly shown.

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