need urgent help -- math symbol notation

The only thing that comes to mind is expected value. Is u(t) a probability function and cos(4PiT) a payout function?

expected value does not make any sense because functions have an exact value

this is an arbitrary equation that has no practical meaning

u(t) = unit step function: { 0, t<1; 1, t>1 }

the other thing that comes to mind is electron volts, but that doesn't fit either

http://mathworld.wolfram.com/EvenPart.html

I've...got it??? Or not??

This seems like it would only make sense for a discrete signal (which would be x[t] not x(t))

since Ev{n} is only defined for positive integers..

Ev{0} = 1, so I am thinking this function would evaluate to:

t < 0, 1
t integer >= 0, 1
t is multiple of 1/4Pi, 1
elsewhere, undefined