What is the sum of u(t) and u(-t) at t=0?

[sfunds]

I am just a beginner in Signals and systems...
In signal addition when we add two signals for example u(t) and u(-t), we are supposed to just add the values of both the signals at each and every point to get the sum,right?
so in the case of u(t)+u(-t), what will be the sum value at t=0? Is it 2 ? Will that be correct?...
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This question may be foolish but please help...

 

[kovachattack]

The values of your signal at different points of t depends upon the signal. The only thing I can tell you from the information that you've given me, is that your signal should be symmetric about the y axis, because that happens when you add u(t) and u(-t). So, u(2)=u(-2), u(3)=u(-3), etc.

But yes, it is essentially just adding two functions.

 

[daviddoria]

I agree with kovachattack. A signal is just an EE word for a function, so adding signals = adding functions.