Someone's "Bacon" number is how many films you have to go through in order to go from that person to Kevin Bacon. For example Patrick Stewart's Bacon number is

Someone's "Bacon" number is how many films you have to go through in order to go from that person to Kevin Bacon. For example Patrick Stewart's Bacon number is 2. Star Trek: First Contact -[James Cromwell]-> Beyond All Boundaries -> Kevin Bacon. Someone's Erdős number is the same concept, but applied to coauthorship on research papers. Someone's Erdős-Bacon number is the sum of those two numbers.