What is the Triangle Inequality and How Does Vector Normalization Work?

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SUMMARY

The discussion focuses on the Triangle Inequality and vector normalization, emphasizing the need for a rigorous proof. The user critiques a provided proof as inadequate, suggesting that it lacks coherence and fails to demonstrate the relationship between the components. A recommendation is made to utilize the definition of a norm, specifically |\vec{v}|^2 = \vec{v} \cdot \vec{v}, to derive |\vec{u} + \vec{v}|^2 effectively. The conversation highlights the importance of foundational concepts in calculus and linear algebra for understanding these mathematical principles.

PREREQUISITES
  • Understanding of vector norms and their definitions
  • Familiarity with the Triangle Inequality theorem
  • Basic knowledge of vector operations, including addition and dot products
  • Foundational concepts from calculus and linear algebra
NEXT STEPS
  • Study the Triangle Inequality theorem in detail
  • Learn about vector normalization techniques
  • Explore the properties of dot products and their applications
  • Review introductory chapters of linear algebra textbooks for foundational concepts
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Students and educators in mathematics, particularly those studying calculus and linear algebra, as well as anyone interested in understanding vector operations and proofs related to the Triangle Inequality.

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http://img405.imageshack.us/img405/8026/prover.jpg

I would say it's pretty weak, how could I improve upon it?

It's supposed to be the triangle inequality.
 
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I don't mean to be rude, but frankly: it's not a proof at all. It's just two columns with a list of things that seem to be unrelated, and something that looks like what you wanted to prove at the bottom.

How about you use the definition of norm, as
[tex]|\vec{v}|^2 = \vec v \cdot \vec v[/tex]
and work out
[tex]|\vec{u} + \vec{v}|^2[/tex]
 
I'm just going off of the material presented in the chapter of a calc/linear algebra book, it is the first chapter and hasn't touched on anything further.

[tex]\overline{A} \overline{B} \ + \ \overline{B} \overline{C} \ = \ \overline{AC}[/tex]

if I'm not mistaken, then I went to normalize the vectors but I think I got it wrong.

I'll just keep reading...
 

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