What do you mean by two sets cross product
Represents the direct product of two sets, also known as Cartesian product
The Descartes product of set a and B can be expressed as a × B = {(a, b) | a ∈ a, B ∈ B}. Generally speaking, this set is a set of ordinal pairs formed by pairwise collocation of elements in a and elements in B
For example, R × r = R & # 178; represents the set of points on the plane
Is vector square dot product or cross product ?
The square of vector a
Is vector a dot multiplied by vector a
Or vector a cross product vector a ?
Multiplication of vector a by vector a
Calculation of cross product of vector
|i j k|
|2 -3 1| =-7i-5j-k
|1 -2 3|
How does this work out,
It seems that the operation of coefficients before J is different from the other two,
I * (- 3) * 3 + J * 1 * 1 + k * 2 * (- 2) - k * (- 3) * 1 - J * 2 * 3 - I * 1 * (- 2) = - 7i-5j-ka11 * A22 * A33 + A12 * A23 * A31 + A13 * A21 * A32 - A12 * A21 * A33 - a11 * A23 * A32 you can see the rule one by one:)