## klimenkov 3 years ago Help me please.

1. klimenkov

How to write in LaTeX this expression? |dw:1362304526322:dw|

2. ParthKohli

$\displaystyle \hat{(\vec{a},\vec{b})}$

3. ParthKohli

 \hat{(\vec{a},\vec{b})} 

4. ParthKohli

Is that what you wanted?

5. klimenkov

Lol. It does not work in Texmaker. Please look at the mistake.

6. ParthKohli

No, no! You have to type \begin{math} and \end{math}. Not the dollar signs!

7. klimenkov

8. klimenkov

$\hat{(\vec{a},\vec{b})}$

9. ParthKohli

Tip: Avoid using all those TeXMakers and all when you have to make very simple documents with just text and math. Use http://www.artofproblemsolving.com/Resources/texer.php? and you can simply use $..$ and $$...$$ or text.

10. ParthKohli

Hmm, in some cases, \vec is actually the vector with the box.

11. klimenkov

Hm.. It is not very simple. There will be a lot of text and formuals and pictures.

12. ParthKohli

Then I don't know :-( @UnkleRhaukus will be able to help.

13. klimenkov

Anyway, thank you for your help. Type something in this topic http://openstudy.com/study#/updates/51331febe4b093a1d948e981 and i will give you a medal.

14. ParthKohli

$\hat{(\stackrel{\rightarrow}{a},\stackrel{\rightarrow}{b})}$Try this one. \hat{(\stackrel{\rightarrow}{a},\stackrel{\rightarrow}{b})}

15. klimenkov

Yeah! Can you tell me what you have done?

16. klimenkov

Hm.. \vec does not work with \hat. What's a pity.

17. ParthKohli

\stackrel{stuff on the top here}{stuff on the bottom here} is used to write a thing above another. It's very hacky

18. klimenkov

Oh, now I see it. $$\vec b$$ is lower that $$\vec a$$. If there was a method to combine \hat and \vec...

19. ParthKohli

Well, this one was the only one I could figure out

20. klimenkov

(\vec{a}\widehat{\rule{0pt}{3.5mm},\,}\vec{b}) This works like this, but it does not work in OpenStudy.

21. ParthKohli

That is because OpenStudy has a very limited version of $$\TeX$$ called MathJax.

22. klimenkov

LaTeX is a very powerful instrument to write furmulas. But such things like this disappoint me.

23. ParthKohli

Hmm

24. UnkleRhaukus

 $\widehat{(\vec a,\vec b)}$  $\widehat{(\vec a,\vec b)}$

25. UnkleRhaukus

 $(\widehat{\vec a,\vec b})$  $(\widehat{\vec a,\vec b})$

26. UnkleRhaukus

what does it mean?

27. klimenkov

This is the angle between vector a and b.