# Notation help? (don't understand)

Tags:
1. Feb 25, 2015

### 1832vin

i might have been spelling them wrong, but i can't find what do they mean:
what's the difference between [psi](x) and [psi tilda](x)? i mean this thingy.. (~)

and what's h(bar)? (in the formular p=h(bar)k) [i mean the bar thing]

and other stuff.. things that i need to know...?
i'm new to the mathematics side of physics, and it's quantum is where is started...
if the order was bad, which order should i learn in? (the only other math i've done is in special...)

and if there are more common notations that i need to know please tell me, thankyou

2. Feb 25, 2015

### Fredrik

Staff Emeritus
$\tilde\psi$ isn't a standard notation, so you will have to look for a definition in the book where you found it. If there isn't one, then maybe it's just an arbitrary function.

$\hbar$ is called the reduced Planck constant. It's defined by $\hbar=\frac{h}{2\pi}$, where $h$ is Planck's constant.

Most notations should be defined in your book. What book are you using?

3. Feb 25, 2015

### 1832vin

thankyou!
it's hard to search for stuff when it is not in the keyboard!