In the article we formalize in the Mizar system [4] preliminary facts needed to prove the Basel problem [7, 1]. Facts that are independent from the notion of structure are included here.
@article{bwmeta1.element.doi-10_1515_forma-2017-0013, author = {Artur Korni\l owicz and Karol P\k ak}, title = {Basel Problem -- Preliminaries}, journal = {Formalized Mathematics}, volume = {25}, year = {2017}, pages = {141-147}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_1515_forma-2017-0013} }
Artur Korniłowicz; Karol Pąk. Basel Problem – Preliminaries. Formalized Mathematics, Tome 25 (2017) pp. 141-147. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_1515_forma-2017-0013/