# Typing in Latex on a mac

1. Nov 26, 2012

### pierce15

Hello everyone,

In the past few days, I have learned quite a bit of basic Latex. Thank you all for the tips. Now for the question: do macs automatically come with a latex typesetter (I think that this is the case), and if so, how do I use it? Right now, I'm just going to use this post to copy and paste something into an email- I'll delete when I'm done.

P.S. Is there a shortcut so I don't have to keep writing tex before and after everything I write?

Last edited: Nov 26, 2012
2. Nov 26, 2012

### Michael Redei

I've never heard of any computer coming aith TeX pre-installed when you buy it, and I just realise that I've been TeXing for nearly 30 years. But you can get a simple-to-install TeX system called "TeX Live" from TUG (TeX User Group) here: http://www.tug.org/texlive/

3. Nov 26, 2012

### pierce15

I just downloaded something and it looks like this. Do you know how I can do some math in this? I tried entering some commands that I learned and pressed "typeset", but here's what came up:

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4. Nov 26, 2012

### Michael Redei

You can try this small example:

\documentclass{article}
\begin{document}
What's the difference between
$E=mc^2$ and $c=\sqrt{\frac{E}{m}}$?
\end{document}

and then press the "Typeset" button just underneath your "traffic lights". You'll find lots of information on how to use TeX from TUG (www.tug.org).

P.S.: The "documentclass" line is part of this example. I don't know how to get it to stay in that box though.

5. Nov 26, 2012

### pierce15

OK, that worked. Can you explain to me why it didn't work until I added the \documentclass{article} and the \begin/end{document}? Also, is there a preferred document class for writing math equations?

6. Nov 26, 2012

### Michael Redei

Your program is switched to "LaTeX" mode (as you can see next to the "Typeset" button). LaTeX provides easier formatting of documents, things like tables of contents, inserting figures etc. than PlainTeX. But LaTeX also demands some framework code, the "documentclass" and a "begin-end{document}" pair.

If you just want to typeset a formula, switch to "TeX" a.k.a. "PlainTeX" (next to the "Typeset" button) and try this:

Here is a nice equation:
$\sqrt{12+\sqrt{12+\sqrt{12+\ldots}}} = 4$.
Care to prove this?
\bye

and click "Typeset".

Last edited: Nov 26, 2012
7. Nov 26, 2012

### pierce15

Thanks a lot! If I need any help I know who to ask :)

Last edited: Nov 26, 2012
8. Nov 26, 2012

### pierce15

By the way, I think I figured out a proof to your problem:

$$\sqrt{12+\sqrt{12+\sqrt{12+\ldots}}} = x$$
$$12+\sqrt{12+\sqrt{12+\sqrt{12+\ldots}}}=x^2$$
$$x^2-x-12=0$$
$$(x+3)(x-4)=0$$
$$x=4 \space or \space x=-3$$

Is there another way of going about this that does not accumulate a negative solution?

P.S. How do you use the $instead of [tex]? It didn't work for me. 9. Nov 26, 2012 ### Michael Redei I used two dollar signs without a space between them, i.e.$ (no space here) $Lots of mathematics$ (no space again) $Test: $$Lots of mathematics$$ Okay, let's say that was a list of variables, since they're often put in italics :-) Your solution to the square-root problem is fine, except that x=-3 must be excluded (a root f anything , no matter how complicated, can't be negative and real). I don't know of any direct way of solving that equation, but you did the only thing possible: assume there is some solution x and try to find it. 10. Nov 26, 2012 ### pierce15 OK, so if you put a$ $w/o a space at the top and bottom of a bunch of lines of equations, you don't have to keep inserting the [tex] and [ /tex]? Test: $$\lim_x\to\infty e^(-x) e^{-\infty} 0$$ 11. Nov 26, 2012 ### Michael Redei Works perfectly for me: $$\lim_x\to\infty e^(-x) e^{-\infty} 0$$ You need braces around subscripts and superscripts though, and an = or two: Code (Text): $$\lim_{x\to\infty} e^{(-x)} = e^{-\infty} = 0$$ gives you $$\lim_{x\to\infty} e^{(-x)} = e^{-\infty} = 0$$ Hmmm... I've been using the preview first before submitting these things. Maybe you should try that too. 12. Nov 26, 2012 ### Michael Redei Does this work inline with just one dollar at each end? Like$a+b=c\$ this?

No :-(

13. Nov 26, 2012

### Staff: Mentor

14. Nov 26, 2012

### pierce15

Sorry, but what does inline mean?

15. Nov 26, 2012

### Michael Redei

Inline maths is set "in the line", like $\tan\alpha = (\sin\alpha)/(\cos\alpha)$, whereas "display-style" maths is set between paragraphs, like
$$\tan\alpha = \frac{\sin\alpha}{\cos\alpha}.$$
This can be easier to read, bit it needs more space.

16. Nov 27, 2012

### Staff: Mentor

"in the middle of a line"

17. Nov 27, 2012

### pierce15

$$Testing Inline$$

Awesome, it worked. Thanks for the advice, guys

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