Parabola Published since 1964, Parabola is now an online Diamond Open Access journal (ISSN 1446-9723) for and by students and anyone else who enjoys maths. Get the latest Current issue Most popular Editorial A novel method of evaluating the Riemann zeta function at even natural numbers using elementary calculus Complex numbers are (un)real? Theoretical foundations and examples of using the method of mathematical induction Beyond the classical straightedge: Exploring the potential of the finite double-edged straightedge An alternative derivation of Cardano’s cubic formula Approximating graphical minimal surfaces through mean curvature flow Pattern occurrence and run enumeration in random binary strings Sum and square sum of consecutive tetrahedral numbers via the Cauchy Residue Theorem The mathematics behind competitive mental calculation Locating the centre of critical points via antiderivative roots Arithmetic progressions hiding in special sets Alternative geometric proofs of two trigonometric limits On the Soddy-Gosset Theorem and its applications Weighted integral inequalities generated by logarithmic derivatives View current issue Problems 1731–1740 An elementary proof that the regular polygon is the largest among polygons that are inscribed in a circle Constructing a model of an amplifier How to derive the quadratic formula Back to Babylonian roots View all issues Issues Read every issue and article on a diverse range of mathematical topics. About us Learn all about Parabola's history and journal scope since 1964. Contribute Get all information on how to submit an article to Parabola.