# Symbol help

• Jan 12th 2010, 10:46 AM
Symbol help
What does a o with a line through it mean?

If you need more help can you give me the latex code for it and i can do a question with it contained thanks.
• Jan 12th 2010, 11:00 AM
Moo
Hello,

$\displaystyle \theta$ ? That's a greek letter, called "theta"

Or $\displaystyle \emptyset$ ? That's the empty set.

But since you put this in calculus, it's more likely the greek letter
• Jan 12th 2010, 11:07 AM
Quote:

Originally Posted by Moo
Hello,

$\displaystyle \theta$ ? That's a greek letter, called "theta"

Or $\displaystyle \emptyset$ ? That's the empty set.

But since you put this in calculus, it's more likely the greek letter

nah the bottom one

Find a scalar function such that $\displaystyle \emptyset$(x,y,z) such that F(x,y,z) = delta(upside down traingle)$\displaystyle \emptyset$(x,y,z)

what do i have to do?

I have the equation F(x,y,z) by the way
• Jan 12th 2010, 11:55 AM
Drexel28
Quote:

nah the bottom one

Find a scalar function such that $\displaystyle \emptyset$(x,y,z) such that F(x,y,z) = delta(upside down traingle)$\displaystyle \emptyset$(x,y,z)

what do i have to do?

I have the equation F(x,y,z) by the way

The empty set makes no sense to me here. Are you sure it isn't find a scalar function $\displaystyle \phi(x,y,z)$ such that $\displaystyle F(x,y,z)=\nabla \phi(x,y,z)$?
• Jan 12th 2010, 12:03 PM
Quote:

Originally Posted by Drexel28
The empty set makes no sense to me here. Are you sure it isn't find a scalar function $\displaystyle \phi(x,y,z)$ such that $\displaystyle F(x,y,z)=\nabla \phi(x,y,z)$?

yes its that

what does this mean?
• Jan 12th 2010, 12:13 PM
Moo
Greek letter "phi"
Hadn't thought of this one (Thinking)
Here, it denotes a function/mapping.

$\displaystyle \nabla$ is the gradient.