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Signals

Contains information about the state and evolution of a system

Kinds

Continuous

Discrete

Signal is an infinite and uncountable set of numbers, as are the possible values each number can have.

The number of elements in the set, as well as the possible values of each element, is finite, countable.

Transformation of the independent variable

Time displacement: The signal runs in time without affecting the dependent variable

Reflection: It is the mirror image of the signal

Staging: Expansion or contraction of the signal around 0