Part of V3D-03 — Vectors: Advanced (Triple Product, Coplanarity)

Properties of the Scalar Triple Product

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Key properties:

  1. Cyclic permutation preserves value: [a b c] = [b c a] = [c a b].
  2. Transposition (swap of two vectors) reverses sign: [a b c] = -[b a c] = -[a c b] = -[c b a].
  3. If any two vectors are equal: [a a c] = 0 (determinant with two equal rows).
  4. If any two vectors are parallel: [a b c] = 0 (one row is a scalar multiple of another).
  5. Linearity: [ka b c] = k[a b c]. More generally, [pa+qd, b, c] = p[a b c]+q[d b c].
  6. [a b c] = 0 if and only if a, b, c are coplanar.
  7. For unit vectors i, j, k: [i j k] = 1.

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