Question about normal matrices

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SUMMARY

The discussion centers on the properties of normal matrices in the complex field, specifically addressing the equation ||Ax|| = ||A*x|| for all vectors x. It is established that if matrix A is normal, defined by the condition AA* = A*A, then the equality holds true. The user successfully demonstrates this relationship using the inner product notation, confirming their understanding of the concept.

PREREQUISITES
  • Understanding of normal matrices and their properties
  • Familiarity with complex vector spaces
  • Knowledge of inner product notation
  • Basic linear algebra concepts
NEXT STEPS
  • Study the implications of normal matrices in spectral theory
  • Explore the relationship between normal matrices and unitary matrices
  • Learn about the spectral theorem for normal operators
  • Investigate applications of normal matrices in quantum mechanics
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Students and professionals in mathematics, particularly those studying linear algebra, complex analysis, or quantum mechanics, will benefit from this discussion.

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Homework Statement


Suppose A is a normal matrix in the complex field.

Homework Equations


Show that ||Ax||=||A*x|| for all x in the complex field

The Attempt at a Solution


If A is normal then AA*=A*A and ||Ax||=(Ax,Ax)=(x,A*Ax)
 
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Never mind i got it=]
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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