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Linear Algebra - Vector Operations

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A×0\mathbf{A} \times \mathbf{0}

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The cross product of vector A with the zero vector, yielding the zero vector, since the zero vector does not have a direction or magnitude to contribute to the cross product.

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AB\mathbf{A} - \mathbf{B}

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The difference between vectors A and B, resulting in a vector pointing from B towards A.

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AB\mathbf{A} \cdot \mathbf{B}

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The dot product of vectors A and B, resulting in a scalar representing the magnitude of A multiplied by the magnitude of B and the cosine of the angle between them.

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AA\mathbf{A} - \mathbf{A}

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The subtraction of vector A from itself, yielding the zero vector.

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A×(kB)\mathbf{A} \times (k\mathbf{B})

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The cross product of vector A with the scalar multiplication of vector B by k, resulting in a vector that is k times larger than A×B\mathbf{A} \times \mathbf{B}, keeping the same direction given by the right-hand rule if k is positive.

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A(BC)\mathbf{A} \cdot (\mathbf{B} - \mathbf{C})

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The distributive property of the dot product, yielding the same result as ABAC\mathbf{A} \cdot \mathbf{B} - \mathbf{A} \cdot \mathbf{C}. The dot product is distributed over the subtraction of vectors B and C.

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projAB\text{proj}_{\mathbf{A}}\mathbf{B}

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The projection of vector B onto vector A, resulting in a vector that lies on A and has a length equal to the component of B that is parallel to A.

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kAk\mathbf{A}

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The scalar multiplication of vector A by a scalar k, where the result is a vector k times as long in the same or opposite direction, depending on the sign of k.

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A+B\mathbf{A} + \mathbf{B}

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The sum of the vectors A and B, resulting in a vector that represents the combined magnitude and direction of A and B.

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A(B+C)\mathbf{A} \cdot (\mathbf{B} + \mathbf{C})

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The distributive property of the dot product, yielding the same result as AB+AC\mathbf{A} \cdot \mathbf{B} + \mathbf{A} \cdot \mathbf{C}. The dot product is distributed over the addition of vectors B and C.

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0A\mathbf{0} \cdot \mathbf{A}

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The dot product of the zero vector with vector A, yielding a scalar of 0 since the zero vector has no magnitude.

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k(AB)k(\mathbf{A} - \mathbf{B})

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Scalar multiplication distributed over vector subtraction, resulting in kAkBk\mathbf{A} - k\mathbf{B}. The difference of the vectors is multiplied by scalar k.

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A(kB)\mathbf{A} \cdot (k\mathbf{B})

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The dot product of vector A with the scalar multiplication of vector B by k, which can be factored out to result in k(AB)k(\mathbf{A} \cdot \mathbf{B}).

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A-\mathbf{A}

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The negation of vector A, resulting in a vector with the same magnitude as A but pointing in the exact opposite direction.

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k(A+B)k(\mathbf{A} + \mathbf{B})

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Scalar multiplication distributed over vector addition, resulting in kA+kBk\mathbf{A} + k\mathbf{B}. The sum of the vectors is multiplied by scalar k.

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A/k\mathbf{A} / k

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The division of vector A by a non-zero scalar k, resulting in a vector each of whose components is divided by k.

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A×(B)\mathbf{A} \times (-\mathbf{B})

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The cross product of vector A with the negation of vector B, yielding a vector that is opposite in direction to A×B\mathbf{A} \times \mathbf{B} and has the same magnitude.

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A||\mathbf{A}||

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The magnitude or norm of vector A, which is a scalar representing the length of A.

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A×B\mathbf{A} \times \mathbf{B}

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The cross product of vectors A and B, resulting in a vector that is perpendicular to both A and B and has a magnitude equal to the area of the parallelogram that A and B span.

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A×(B×C)\mathbf{A} \times (\mathbf{B} \times \mathbf{C})

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The cross product of vector A with the cross product of vectors B and C, where the result is a vector not necessarily perpendicular to A.

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