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What is a dummy variable?

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in Signals and Systems by (1.2m points)
What is a dummy variable?

(a) Unused variable

(b) Extra variable

(c) Free variable

(d) Something that is used to store extra numbers

The question was asked in unit test.

I would like to ask this question from Continuous Time Convolution in chapter Time-Domain Analysis of CT Systems of Signals and Systems

1 Answer

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by (42.1k points)
Correct choice is (c) Free variable

To elaborate: A free variable or a dummy variable which are mostly used in LTI systems are notation that specifies places in an expression where substitution may take place. They are very useful for calculation of convolution.

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