# Typing operators in PF threads

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1. Jun 23, 2015

### fireflies

Hi, I am new here. I don't know how can I type mathematical operators or symbols here. Can anyone help me out?

2. Jun 23, 2015

### RUber

3. Jun 23, 2015

### fireflies

Lots of codes there, but still a solution. Thank you

4. Jun 23, 2015

### dlgoff

If you just need something quick when replying to a post, click on the and you'll get a list of symbols that you can pick from that will be inserted.

5. Jun 23, 2015

### fireflies

Yeah, it's working. Thanks

6. Jun 24, 2015

### Staff: Mentor

The LaTeX I use most often is for fractions, integrals, limits, and sums.
For inline LaTeX, use two # symbols at the beginning and two more at the end of the LaTeX script.
For standalone LaTeX, use two \$ symbols at the beginning and two more at the end. I don't care much for the standalone forms, because our new forum software centers the stuff on the middle of the line.

Here is some sample script without the # symbols fore and aft, so you can see what it looks like, followed by how the script renders in both inline and standalone form:

Fractions:
\frac {a + b}{c + d}
Renders as:
$\frac {a + b}{c + d}$
$$\frac {a + b}{c + d}$$

Integrals:
\int_{x = 0}^{12} f(t) dt
$\int_{x = 0}^{12} f(t) dt$
$$\int_{x = 0}^{12} f(t) dt$$

Limits:
\lim_{n \to \infty} \frac{n}{2n - 1} = \frac{1}{2}
Renders as:
$\lim_{n \to \infty} \frac{n}{2n - 1} = \frac{1}{2}$
$$\lim_{n \to \infty} \frac{n}{2n - 1} = \frac{1}{2}$$

Sums:
\sum_{n = 0}^{N}a_n
$\sum_{n = 0}^{N}a_n$
$$\sum_{n = 0}^{N}a_n$$

7. Jun 24, 2015

### fireflies

Wow! I actually was looking forlimits. But what is inline and standalone latex?

8. Jun 24, 2015

### Staff: Mentor

Inline is for inserting the expression right in the middle of surrounding text, such a $\sqrt{2x + 1}$.

Standalone puts a slightly more expanded version on its own line: $$\sqrt{2x + 1}$$

BTW, what I typed was \sqrt{2x + 1}

For a cube root, \sqrt[3]{2x + 1}

9. Jun 24, 2015

### EM_Guy

Making an attempt:

$\frac {a + b} {c + d}$

$y = a x^2 + b x + c$

$\Delta \theta = \omega_0 t + \frac {1}{2} \alpha t^2$

10. Jun 24, 2015

### fireflies

\frac{1}{2} nothing happens!

11. Jun 24, 2015

### EM_Guy

Put that text between double hash tags.

$\frac{1}{2}$

12. Jun 24, 2015

### fireflies

$\frac{1}{2}$

Great!

13. Jun 24, 2015

### Staff: Mentor

Like I said earlier,

14. Jun 24, 2015

### fireflies

Yeah, now it's all clear to me. Thanks