Complex Numbers and Equations Quiz
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Questions and Answers

Which property characterizes a normal subgroup in group theory?

  • Invariance under conjugation (correct)
  • Commutativity
  • Closure under products
  • Closure under inverses

What is the concept in group theory that deals with subsets that form a group structure?

  • Lagrange's theorem
  • Cosets
  • Cyclic subgroups (correct)
  • Normal subgroups

What type of matrix has entries that are symmetric with respect to the main diagonal?

  • Orthogonal
  • Symmetric (correct)
  • Hermitian
  • Skew symmetric

Which property characterizes an integral domain in ring theory?

<p>Every non-zero element has a multiplicative inverse (D)</p> Signup and view all the answers

In linear algebra, what term describes a set of vectors where one vector can be written as a linear combination of the others?

<p>Dependent set (D)</p> Signup and view all the answers

What theorem states that every square matrix satisfies its own characteristic equation?

<p>Cayley-Hamilton theorem (C)</p> Signup and view all the answers

What is the definition of De-Moivre's theorem?

<p>Formula for raising a complex number to an integer or rational power (A)</p> Signup and view all the answers

Which group is an example of a nonabelian group?

<p>Permutation group S3 (C)</p> Signup and view all the answers

What is the relationship between the arithmetic mean (AM), geometric mean (GM), and harmonic mean (HM)?

<p>AM &gt; GM &gt; HM (A)</p> Signup and view all the answers

Which method is used to solve biquadratic equations according to the text?

<p>Ferrari's method (D)</p> Signup and view all the answers

What does the m-th power theorem state?

<p>$($AM $ imes$ GM $ imes$ HM$)^m \= ($AM$)^{2m}$ (A)</p> Signup and view all the answers

What is the definition of z^a in complex numbers?

<p>$z^a = e^{(a heta)}$ (B)</p> Signup and view all the answers

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