The degree of an isogeny is a numerical value that measures the 'size' or 'complexity' of the map between two elliptic curves or abelian varieties. It indicates the number of points in the fiber of a morphism, and thus reflects how many times one curve wraps around another. This concept is vital for understanding how these curves relate to each other, especially when considering properties like rational points and their behavior under morphisms.
congrats on reading the definition of Degree of an isogeny. now let's actually learn it.