Extended supersymmetry
In theoretical physics, extended supersymmetry is supersymmetry whose infinitesimal generators Q i α {\displaystyle Q_{i}^{\alpha }} carry not only a spinor index α {\displaystyle \alpha } , but also an additional index i = 1 , 2 … N {\displaystyle i=1,2\dots {\mathcal {N}}} where N {\displaystyle {\mathcal {N}}} is integer (such as 2 or 4). Extended supersymmetry is also called N = 2 {\displaystyle {\mathcal {N}}=2} , N = 4 {\displaystyle {\mathcal {N}}=4} supersymmetry, for example.