Unit Step Function: u(-t) Meaning & Negative Time

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The unit step function u(t) is defined as 1 for t >= 0 and 0 otherwise, while u(-t) is defined as 1 for t <= 0 and 0 otherwise. The discussion clarifies that negative time is not being considered; instead, the argument of the function is negative. This means that u(-t) effectively represents a step function that activates at or before t = 0. Understanding these definitions is crucial in the context of signal processing and systems analysis. The distinction between the time variable and the function argument is key to interpreting the behavior of u(-t).
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what does the u(-t) mean in unit step funtion in basic function of signal and system?how can be time taken as -ve?
 
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u(t) is unit step function right? It means that u=1 for t>=0 and u=0 otherwise.
In the same way u(-t) can be understood. That is u=1 for t<=0 and u=0 otherwise.
Here time is not taken as -ve but only the argument to u is taken as -ve.
 

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