# MATH SYMBOL Help Figure?

1. Nov 8, 2009

### j_penac13

Hello there! Im in a class of signal and communication systems and found this symbol:
‹[·]› But I cant figure what it means, teacher told us to research it. Been reading books like crazy and cant find anything. Hope you can help me.

I put a picture of how he used it, if that helps you.

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2. Nov 8, 2009

### fourier jr

looks kind of like a fourier transform of [.]

3. Nov 8, 2009

### j_penac13

Well, the problem isnt the whole operation, because it is kinda fourier transform. Thing is what does [.] mean?!

4. Nov 8, 2009

### Office_Shredder

Staff Emeritus
Sometimes authors will use a dot to denote where the thing to be operated is supposed to go. For example, the inner product is linear in the first term can be written as:
< . ,u> is linear for any fixed u. Maybe something similar to that? Not sure about the brackets

5. Nov 8, 2009

### fourier jr

the average value of a function f is usually written as $$\frac{1}{b-a} \int_{a}^{b}{f(x)dx}$$

so set a = -T/2 & b = T/2 & then T--> infinity...... that's more like it