Erdős number

An Erdős number measures how closely a mathematician is connected to the renowned mathematician Paul Erdős through academic collaborations. If someone co-authored a paper directly with Erdős, their Erdős number is 1. If they didn't collaborate directly but worked with someone who has an Erdős number of 1, their number is 2, and so on. It’s a way to illustrate the collaborative distance within the mathematical community, showcasing the interconnectedness of researchers and their collective contribution to the field.