Is Addition Distributive Over the Dot Product in Vector Calculations?

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SUMMARY

The discussion confirms that addition does not distribute over the dot product in vector calculations, specifically demonstrating that a(b+c) is not equal to ab+ac. Using Vector A (0, 1, 0) and Vector B (1, 0, 0), the cross product A×B results in (0, 0, -1). This example effectively illustrates the non-distributive property of addition over the dot product in vector mathematics.

PREREQUISITES
  • Understanding of vector operations, specifically dot and cross products.
  • Familiarity with vector notation and component representation.
  • Basic knowledge of linear algebra concepts.
  • Ability to perform vector calculations in three-dimensional space.
NEXT STEPS
  • Study the properties of vector operations, focusing on dot and cross products.
  • Explore examples of vector addition and multiplication in linear algebra.
  • Learn about the geometric interpretations of vector operations.
  • Investigate the implications of non-distributive properties in physics and engineering applications.
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Students of mathematics, physics, and engineering, particularly those studying vector calculus and linear algebra, will benefit from this discussion.

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Homework Statement


Verify using an example that a(b+c) is not equal to ab+ac. (This means that addition does not distribute over the dot product.)

Vector A be in the y direction (Ax=0 , Ay=1 , Az = 0)
Vector B be in the x direction (Bx=1 , By=0 , Bz = 0)

so, Vector A×B components:

x = Ay * Bz - By * Az = 0
y = Az * Bx - Bz * Ax = 0
z = Ax * By - Bx * Ay = -1

so,

AxB = (0 , 0 , -1)

would this work?

Homework Equations

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