A geometric proof that for geometric series convergence Posted on 2019/10/09 by Carl Robitaille A geometric proof that for 0<r<1, (1-r) + (1-r)r + (1-r)r² + … = 1, and therefore that 1 + r + r² + … = 1/(1 – r) pic.twitter.com/r22dM7PoUM— Andrew M. Webb (@AndrewM_Webb) October 8, 2019