There are two slightly different ways to describe the N = 2 superconformal algebra, called the N = 2 Ramond algebra and the N = 2 Neveu-Schwarz algebra, which are isomorphic (see below) but differ in the choice of standard basis.
If r,s\in {\Bbb Z} in these relations, this yields the N = 2 Ramond algebra; while if r,s\in {1\over 2}+{\Bbb Z} are half-integers, it gives the N = 2 Neveu-Schwarz algebra.