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Theta-Functions and Modular Equations

In: Ramanujan’s Notebooks

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  • Bruce C. Berndt

    (University of Illinois at Urbana-Champaign, Department of Mathematics)

Abstract

Chapters 16–21 in his second notebook [22] contain much of Ramanujan’s prodigious outpouring of discoveries about theta-functions and modular equations. However, the unorganized pages in the second and third notebooks also embrace a large amount of Ramanujan’s findings on these topics. In this chapter, we shall discuss most of this material. In Chapter 33 (Part V [9]), we relate Ramanujan’s fascinating theories of elliptic functions and modular equations with alternative bases. Chapter 26 contains Ramanujan’s theorems on inversion formulas for the lemniscate and allied integrals. Some material that normally would be placed in the present chapter is connected with continued fractions and so has been put in Chapter 32 (Part V [9]) on continued fractions.

Suggested Citation

  • Bruce C. Berndt, 1994. "Theta-Functions and Modular Equations," Springer Books, in: Ramanujan’s Notebooks, chapter 0, pages 138-244, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4612-0879-2_5
    DOI: 10.1007/978-1-4612-0879-2_5
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