Process Control and Instrumentation
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since

The Laplace transform integral of exp(at) has initial values only for s > a
The Laplace transform of integral of exp(at) has finite values only for s > a
The function exp(at) is piece-wise continuous only for s > a
The function is exponential

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Process Control and Instrumentation
Time constant is the

Same as dead time
Same as transportation lag
Time taken by the controlled variable to reach 63.2% of its full change
Time required by the measured variable to reach 63.2% of its ultimate change

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