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Dot (.)

Dot product (WMA link)

Dot[x, y]

x . y

computes the vector dot product or matrix product x . y.

Scalar product of vectors:

• • {a, b, c} . {x, y, z}

Product of matrices and vectors:

• • {{a, b}, {c, d}} . {x, y}

Matrix product:

• • {{a, b}, {c, d}} . {{r, s}, {t, u}}

• • a . b