2.1.2 Classification of sequence Right-side x[n]=0, for -o<n<N eft-side xn]=0,forN<n≤+∞ WO-SIde xn]≠0,for-∞0<n<+∞ Finite-length x[n]=0, outside of m1≤n≤N2 Causal xn=0, for n<0 Noncausal xn]≠0,orn<09 2.1.2 Classification of sequence Right-side x[n] = 0, for −  n  N x[n] = 0, for N  n  + x n for n [ ] 0,  −    +1 2 x[n] = 0,outsideof N  n  N x[n] = 0, for n  0 x[n]  0, for n  0 Left-side Two-side Finite-length Noncausal Causal