Is there a way to compute coefficients of half-integral-weight modular forms in Sage?
Specifically I want the coefficients of the weight 5/2 form on Gamma_0 (4*13) that is in Shimura-Kohnen correspondence with the weight 4 newform (of degree 1) on Gamma_0(13). The first few coefficients of the weight 4 form are: q - 5*q^2 - 7*q^3 + 17*q^4 - 7*q^5 +... (I can get the right coefficients up to sign using the Jacobi form of weight 3 and index 13 but can't get the right signs of the coefficients this way...) Thanks, Kim --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
