# Default algorithm for cardinality

Hello, I am using Sage for operations on elliptic curves and I was curious what is the default algorithm used to compute the cardinality of a curve when: "E.cardinality()" is used? I tried to find it here: http://doc.sagemath.org/html/en/refer... but I only found out there are some algorithms which you can choose as an optional argument. Is it the Schoof's algorithm?