Module 1 : Signals In Natural Domain
Lecture 2 : Description of Signals
   Conclusion:
   In this lecture you have learnt:
Thus a signal may also be defined as a mapping from one set (domain) to another (co domain).
Continuous-time signal means the mapping is defined over a continuum of values of the independent variable.

A discrete variable is one which can ultimately be indexed by integers (may also be in terms of tuples) .

We will enclose discrete variables in brackets [.] as opposed to parenthesis (.) for continuous variables.

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