Derivative of the step function: u(-t)

[JonForbes]

I need to know the derivative of the step function u(-t).

I believe it is: -&(-t)
where & represents the impulse function.

Is this correct?

Thanks.

 

[rock.freak667]

Yes that should be correct if I recall the properties of the step function correctly.

 

[JonForbes]

Thanks, just needed someone with more knowledge than me to confirm it.