Davis, Harold T. Introduction to nonlinear differential and integral equations. Unabridged and unaltered version of the work first published in 1960. (English) Zbl 0106.28904 New York: Dover Publications, Inc., XV, 562 p. (1962). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 340 Documents Keywords:ordinary differential equations × Cite Format Result Cite Review PDF Online Encyclopedia of Integer Sequences: Expansion of psi(x) / phi(x) in powers of x where phi(), psi() are Ramanujan theta functions.