Dedekind zeta function - Quiz
  • 1. What kind of continuation do Dedekind zeta functions have to the complex plane?
A) Holomorphic continuation
B) Polynomial continuation
C) Meromorphic continuation
D) Logarithmic continuation
  • 2. How many poles does the Dedekind zeta function have in its analytic continuation?
A) Infinitely many poles
B) One simple pole
C) Two simple poles
D) No poles
  • 3. At what value of s does the Dedekind zeta function have its pole?
A) s = -1
B) s = 0
C) s = 1
D) s = 1/2
  • 4. Which formula gives the residue of the Dedekind zeta function at its pole?
A) Functional equation
B) Euler product formula
C) Discriminant formula
D) Class number formula
  • 5. What arithmetic data does the class number formula combine?
A) Gamma and beta factors
B) Invariants of the unit group and class group
C) Real and complex places
D) Invariants of the prime ideals and residues
  • 6. The construction of analytic continuation usually uses the fact that the Dedekind zeta function is what type of function for a trivial Hecke character?
A) Riemann zeta function
B) Gamma function
C) Dirichlet L-series
D) Hecke L-function
  • 7. Who was the first to prove the analytic continuation and functional equation for Hecke L-functions in 1917?
A) Bernhard Riemann
B) John Tate
C) Richard Dedekind
D) Erich Hecke
  • 8. Whose doctoral thesis simplified the complicated methodology used by Hecke in 1950?
A) Erich Hecke
B) Leonhard Euler
C) Carl Friedrich Gauss
D) John Tate
  • 9. The functional equation for the Dedekind zeta function relates its values at s and which other value?
A) 1 / s
B) s - 1
C) -s
D) 1 - s
  • 10. What does delta_K denote in the functional equation?
A) Degree of K
B) Class number of K
C) Discriminant of K
D) Unit group of K
  • 11. What does r1 denote in the context of the number field K?
A) Number of real places
B) Discriminant of K
C) Class number
D) Number of complex places
  • 12. What does r2 denote in the context of the number field K?
A) Number of real places
B) Degree over Q
C) Number of conjugate pairs of complex places
D) Total number of embeddings
  • 13. How is the degree of K over Q expressed using r1 and r2?
A) r1 + 2 * r2
B) r1 + r2
C) 2 * r1 + r2
D) r1 * r2
  • 14. What is the definition of the real gamma factor Gamma_R(s)?
A) pi-s/2 * Gamma(s/2)
B) (2 * pi)-s/2 * Gamma(s/2)
C) pi-s * Gamma(s)
D) (2 * pi)-s * Gamma(s)
  • 15. What is the definition of the complex gamma factor Gamma_C(s)?
A) pi-s/2 * Gamma(s/2)
B) (2 * pi)-s/2 * Gamma(s)
C) pi-s * Gamma(s/2)
D) (2 * pi)-s * Gamma(s)
  • 16. How is Lambda_K(s) constructed?
A) Using the class number and unit group
B) Using only the Riemann zeta function
C) Using Hecke characters alone
D) Using absolute discriminant, gamma factors, and zeta_K(s)
  • 17. What equation does Lambda_K(s) satisfy?
A) Lambda_K(s) = Lambda_K(1 - s)
B) Lambda_K(s) = Lambda_K(s - 1)
C) Lambda_K(s) = Lambda_K(-s)
D) Lambda_K(s) = -Lambda_K(s)
  • 18. What do the trivial zeroes of the Dedekind zeta function do?
A) Cancel poles of the gamma factors
B) Shift the critical line
C) Create new poles in the complex plane
D) Determine the class number
  • 19. What are nontrivial zeroes of the Dedekind zeta function?
A) Values where s = 1
B) Roots of the discriminant
C) Common zeros of zeta_K and Lambda_K
D) Poles of the gamma factors
  • 20. In what vertical strip must nontrivial zeros lie, according to the functional equation and Euler product?
A) -1 <= Re(s) <= 0
B) 0 <= Re(s) <= 1
C) 0 <= Re(s) <= 1/2
D) 1 <= Re(s) <= 2
  • 21. With respect to which line are the nontrivial zeros symmetric?
A) Vertical line Re(s) = 1
B) Critical line Re(s) = 1/2
C) Imaginary axis
D) Real line Re(s) = 0
  • 22. The Xi function defined for the Dedekind zeta function is analogous to the Xi function defined from which function?
A) Gamma function
B) Riemann zeta function
C) Hecke L-function
D) Dirichlet series
  • 23. What does the function Xi_K(s) do to the poles of Lambda_K?
A) Removes the poles, producing an entire function
B) Shifts the poles to the real line
C) Doubles the number of poles
D) Turns poles into zeroes
  • 24. Where does the Xi_K function move the critical line?
A) To Re(s) = 1
B) To the imaginary axis
C) To infinity
D) To the real line
  • 25. What functional equation does Xi_K satisfy in terms of complex conjugates?
A) Xi_K(overline{s}) = Xi_K(s)
B) Xi_K(s) = Xi_K(1 - s)
C) Xi_K(overline{s}) = overline{Xi_K(s)}
D) Xi_K(overline{s}) = -Xi_K(s)
  • 26. How can the Dedekind zeta function be defined?
A) As a differential equation
B) As a matrix determinant
C) As a Dirichlet series
D) As a finite sum
  • 27. Who is the Dedekind zeta function named after?
A) Richard Dedekind
B) Peter Gustav Lejeune Dirichlet
C) Bernhard Riemann
D) Carl Friedrich Gauss
  • 28. What type of ring is the ring of integers of a number field?
A) A polynomial ring
B) A Dedekind ring
C) A Euclidean domain
D) A field of fractions
  • 29. For general number rings, what are the main objects of interest instead of prime elements?
A) Prime ideals
B) Rational integers
C) Quotient rings
D) Principal ideals
  • 30. What is the absolute norm equal to for rational integers?
A) Always one
B) The non-negative integer generating the ideal
C) Zero
D) The square of the generator
  • 31. What mathematical bound is used along with summing over all ideal classes to show the growth bound?
A) Cauchy's bound
B) Riemann's bound
C) Minkowski's bound
D) Dirichlet's bound
  • 32. What is the growth bound for the sum of I(n) for n less than or equal to x?
A) O(1)
B) O(x)
C) O(xs)
D) O(log x)
  • 33. What is true about the norm function with respect to the multiplication of ideals?
A) It is logarithmic
B) It is constant
C) It is multiplicative
D) It is additive
  • 34. What kind of product is the Euler product in the region Re(s) > 1?
A) Divergent
B) Absolutely convergent
C) Conditionally convergent
D) Asymptotically zero
  • 35. What is the multiplicity of the trivial zeros of ζ_K(s) at non-zero even negative integers?
A) r1 + r2
B) r1 + r2 - 1
C) r1 - r2
D) r2
  • 36. What is the multiplicity of the trivial zeros of ζ_K(s) at odd negative integers?
A) r1 + r2
B) r2
C) r1
D) r1 + r2 - 1
  • 37. Who showed that ζ_K(s) is a non-zero rational number at odd negative numbers when K is totally real?
A) Siegel
B) Dedekind
C) Riemann
D) Taylor
  • 38. What are two fields called if they have the same Dedekind zeta function?
A) Algebraically closed
B) Arithmetically equivalent
C) Conjugate fields
D) Isomorphic
  • 39. Who showed in 1977 that two number fields are arithmetically equivalent based on inertia degrees?
A) Perlis
B) Bosma
C) de Smit
D) Artin
  • 40. What year did Bosma and de Smit use Gassmann triples to find arithmetically equivalent non-isomorphic fields?
A) 1977
B) 2002
C) 1983
D) 1995
  • 41. The Dedekind zeta function is a special case of the Hasse-Weil zeta function for which scheme?
A) Spec L
B) Spec O_K
C) Spec Q
D) Spec Z
  • 42. What specific representation of the Galois group yields the Dedekind zeta function as an Artin L-function for a finite extension L/K?
A) The induced representation
B) The regular representation
C) The Galois representation
D) The trivial representation
  • 43. For a finite Galois extension L/K, the Dedekind zeta function of L is the Artin L-function for which representation of Gal(L/K)?
A) The regular representation
B) The alternating representation
C) The trivial representation
D) The standard representation
  • 44. In the non-Galois extension formula, what group is denoted by H?
A) Spec O_K
B) Gal(L/K)
C) Gal(M/L)
D) Gal(M/K)
  • 45. What allows the factorization of the Dedekind zeta function to be described in terms of Hecke L-functions when L/K is an abelian extension?
A) Selberg orthonormality
B) Aramata–Brauer theorem
C) Artin reciprocity
D) Quadratic reciprocity
  • 46. Primitive Hecke characters correspond to what kind of representations of the abelian Galois group?
A) Irreducible representations
B) Reducible representations
C) Trivial representations
D) Quadratic representations
  • 47. In the zeta function formula for a quadratic field, what is the character chi used as?
A) A prime number
B) An entire function
C) A Galois group
D) A Jacobi symbol
  • 48. The fact that the zeta function of a quadratic field is a product of the Riemann zeta function and a Dirichlet L-function is an analytic formulation of what law?
A) Artin reciprocity law
B) Dedekind conjecture
C) Aramata–Brauer theorem
D) Quadratic reciprocity law
  • 49. For general Galois extensions, the Dedekind conjecture follows from which theorem?
A) Artin reciprocity
B) Selberg orthonormality conjecture
C) Aramata–Brauer theorem
D) Uchida and van der Waall theorem
  • 50. Which of the following implies the general case of the Dedekind conjecture?
A) The Riemann hypothesis
B) The Dirichlet L-function formula
C) The quadratic reciprocity law
D) The Artin conjecture
  • 51. Which conjecture besides the Artin conjecture can the general case of the Dedekind conjecture follow from directly?
A) The quadratic field conjecture
B) The Riemann zeta conjecture
C) The Selberg orthonormality conjecture
D) The abelian extension conjecture
  • 52. What allows one to distinguish trivial and non-trivial zeros of Dedekind zeta functions?
A) The critical line
B) The functional equation
C) Bernoulli numbers
D) Algebraic K-theory
  • 53. There are attempts to generalize the relation between Bernoulli numbers and values of the Riemann zeta function at what types of numbers?
A) Imaginary numbers
B) Zero and positive integers
C) Negative odd integers
D) Positive even integers
  • 54. According to Siegel, for a totally real field, the values of zeta_K(s) at negative integers are what kind of numbers?
A) Nonzero rational numbers
B) Imaginary numbers
C) Transcendental numbers
D) Negative integers
  • 55. Who conjectured specific values for the rational numbers of zeta_K(s) at negative integers in terms of algebraic K-theory?
A) Bernoulli
B) Riemann
C) Stephen Lichtenbaum
D) Siegel
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