Key points are not available for this paper at this time.
the following question arises: Can this latter formula be derived by squaring both sides of the former? There have been several proofs of Euler's formula, or its equivalent formulation ζ(2)=π2/6, based on the idea of squaring 1−13+15−⋯=π4, including a proof presented in a letter from Euler to Goldbach dating from 1742. We consider the history of proofs of this form, and we offer another simple proof of ζ(2)=π2/6 that also relies on squaring Gregory's series.
Campbell et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: