The circle is a simple, intuitive, and common image. It possesses eternal secrets, like the transcendental number, π, the exact value of which remains as elusive as ever; we’ve used many ways to calculate it, but we’ve never managed to arrive at its precise value, however close we may have gotten.
“The circle” is an “absolute truth” lying right before our eyes. We have countless ways of approaching it: the cyclotomic method, infinite series and continued fraction, etc. Among these, the most incredible one was devised by the brilliant mathematician Srinivasa Ramanujan, whose remarkable insight produced a series for π that seems irregular at first, but...