Signals in Natural Domain
Chapter 2 : Simple Operations and properties of Sequences
 
 Sequence addition:
Let {x[n]} and {y[n]}be two sequences. The sequence addition is defined as term by term addition. Let {z[n]} be the resulting sequence
{z[n]} = {x[n]} + {y[n]}
where each  term                                              z[n] = x[n] + y[n]
We will use the following notation
                                                           {x[n]} + {y[n]} = {x[n] + y[n]}