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On evaluations of the modular $j$--invariant by modular equations of degree 2

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We derive modular equations of degree 2 to establish explicit relations for the parameterizations for the theta functions $\varphi$ and $\psi$. We then find specific values of the parameterizations to evaluate some new values of the modular $j$--invariant in terms of $J_n$.

Abstract

We derive modular equations of degree 2 to establish explicit relations for the parameterizations for the theta functions $\varphi$ and $\psi$. We then find specific values of the parameterizations to evaluate some new values of the modular $j$--invariant in terms of $J_n$.

참고문헌 (8)

  1. B. C. Berndt, "Ramanujan’s Notebooks. Part V" (1998), Springer–Verlag
  2. B. C. Berndt, "Ramanujan’s Notebooks. Part III" (1991), Springer–Verlag
  3. B. C. Berndt, "Number Theory in the Spirit of Ramanujan" (2006), American Mathematical Society
  4. B. C. Berndt, "Ramanujan and the modular j–invariant", Canad. Math. Bull, 42(4), pp.427~440 (1999)
  5. D. A. Cox, "Primes of the Form x2 + ny2" (1989), Wiley
  6. J. Yi, "The Construction and Applications of Modular Equations", Ph.D., pp.2001
  7. J. Yi, "Theta-function identities and the explicit formulas for theta-function and their applications", J. Math. Anal. Appl, 292(2), pp.381~400 (2004)
  8. J. Yi, "The explicit formulas and evaluations of Ramanujan’s theta-function ψ", J. Math. Anal. Appl, 321(1), pp.157~181 (2006)

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