Proving Matrix Norm Inequality for Frobenius-Norm and Operator Norm

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SUMMARY

The discussion centers on proving the matrix norm inequality for the Frobenius norm and the operator norm, specifically demonstrating that F(AB) ≤ F(B) * ||A||2, where F(AB) represents the Frobenius norm of the product of matrices A and B, and ||A||2 denotes the operator norm of matrix A. Participants emphasize the need to define both norms clearly and explore their relationship to effectively approach the proof. The conversation highlights the importance of understanding the mathematical foundations of these norms to facilitate the proof process.

PREREQUISITES
  • Understanding of Frobenius Norm and its properties
  • Knowledge of Operator Norm and its definitions
  • Familiarity with matrix multiplication and its implications on norms
  • Basic linear algebra concepts, particularly regarding matrix inequalities
NEXT STEPS
  • Research the properties and applications of Frobenius Norm in linear algebra
  • Study the definitions and characteristics of Operator Norm in detail
  • Explore examples of matrix norm inequalities and their proofs
  • Learn about the relationship between different matrix norms and their implications in mathematical proofs
USEFUL FOR

Mathematicians, students studying linear algebra, and anyone involved in theoretical computer science or numerical analysis who seeks to deepen their understanding of matrix norms and inequalities.

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Homework Statement



Let F(AB) be the Frobenius-Norm in respect of the matrix A*B. And let ||A||2 be the operator norm. I have to show that

F(AB)<=F(B)*||A||2

2. The attempt at a solution

I wrote F(AB) in terms of sums and then tried to go on. But I don't know how I could include the necessary operator norm into the inequality.
 
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Mhhh, isn't there anyone that can help me?
 
You say you "tried to go on" but haven't shown anything at all of what you actually did. You might start by defining "Frobenius Norm" and "operator norm". How are thy related.
 

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