# Symbol help

• Jan 12th 2010, 11:46 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, 12:00 PM
Moo
Hello,

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

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

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

Originally Posted by Moo
Hello,

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

Or $\emptyset$ ? 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 $\emptyset$(x,y,z) such that F(x,y,z) = delta(upside down traingle) $\emptyset$(x,y,z)

what do i have to do?

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

nah the bottom one

Find a scalar function such that $\emptyset$(x,y,z) such that F(x,y,z) = delta(upside down traingle) $\emptyset$(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 $\phi(x,y,z)$ such that $F(x,y,z)=\nabla \phi(x,y,z)$?
• Jan 12th 2010, 01:03 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 $\phi(x,y,z)$ such that $F(x,y,z)=\nabla \phi(x,y,z)$?

yes its that

what does this mean?
• Jan 12th 2010, 01:13 PM
Moo
Greek letter "phi"
Hadn't thought of this one (Thinking)
Here, it denotes a function/mapping.

$\nabla$ is the gradient.