A Continued Fraction of Ramanujan and Some Ramanujan-Weber Class Invariants


Chandrashekar Adiga, Nasser Abdo Saeed Bulkhalib, Yilmaz Simsek, H M Srivastava




On Page 36 of his “lost” notebook, Ramanujan recorded four q-series representations of the famous Rogers-Ramanujan continued fraction. In this paper, we establish two q-series representations of Ramanujan’s continued fraction found in his “lost” notebook. We also establish three equivalent integral representations and modular equations for a special case of this continued fraction. Furthermore, we derive continued-fraction representations for the Ramanujan-Weber class invariants 1n and Gn and establish formulas connecting 1n and Gn. We obtain relations between our continued fraction with the Ramanujan- G¨ollnitz-Gordon and Ramanujan’s cubic continued fractions. Finally, we find some algebraic numbers and transcendental numbers associated with a certain continued fraction A(q) which is related to Ramanujan’s continued fraction F(a; b; ; q); the Ramanujan-G¨ollnitz-Gordon continued fraction H(q) and the Dedekind eta function (s).