Introducing LaTeX Math Typesetting

[Hurkyl]

Is there a smaller triangle that goes well here? What's the command for the floor and ceiling functions? Am I spelling the command for omicron wrong, or is omicron identical to 'o' so there isn't a command?

$$\Delta x \triangle x$$
$\Delta x \triangle x$

 

[Ambitwistor]

$$ab$$
$$a b$$
$$a\! b$$
$$a\, b$$
$$a\: b$$
$$a\; b$$

 

[Ambitwistor]

Originally posted by Hurkyl
Is there a smaller triangle that goes well here?

What do you want a triangle for?

What's the command for the floor and ceiling functions?

$$\lfloor x \rfloor, \lceil y \rceil$$

Am I spelling the command for omicron wrong, or is omicron identical to 'o' so there isn't a command?

The latter.

 

[Ambitwistor]

'~' isn't really intended to add space in LaTeX; it's just like a regular space, except it's non-breaking (LaTeX won't try to insert a line break there).

 

[Hurkyl]

$$f(x + \Delta x) = f(x) + f'(x) \Delta x + \varepsilon(\Delta x) \Delta x$$

The triangle seems a little on the big side to me.

 

[Ambitwistor]

The triangle seems a little on the big side to me.

The triangle, or the letter Delta? If you mean the triangle, what are you trying to use it for?

 

[Hurkyl]

Yes, it's the letter delta; I want to use it as one notates a differential or a difference, as in $\Delta x$ (my previous post is the theorem I wanted to state in a post; I copped out with $\delta x$ but I prefer the capital delta).

When I write it by hand, I usually write the delta as the same height as a lower case letter... but now that I've checked some reference material, it seems that the full-size is the norm; ah well. I'd still like to know if I can make a half sized one should I want to in a post.

 

[Ambitwistor]

It may not be too easy to get a small Delta of the correct size...

$$\Delta x$$
$$\mbox{\small \displaystyle\Delta} x$$

 

[Loren Booda]

I have trouble opening

https://www.physicsforums.com/misc/howtolatex.pdf

 

[jcsd]

Have you got Adobe Acrobat Reader?

http://www.adobe.com/products/acrobat/readstep2.html

 

[Hurkyl]

$\frac{\mathbb{N}}{\mathbb{N}}=\mathbb{N}$why am I over here?

For some reason this image contains a lot of whitespace on my browser; the text is all on the right side of the message!

 

[Loren Booda]

This LaTeX seems to be missing the Greek letter "omicron."

 

[chroot]

Originally posted by Loren Booda
This LaTeX seems to be missing the Greek letter "omicron."

All LaTeX is "missing" this character. The Greek omicron is exactly the same as the Roman 'o,' and thus has no special \omicron command. Just use 'o.' It's the same story with \Alpha and \Rho and so on.

- Warren

 

[chroot]

Hurkyl,

I'm not exactly sure why that's happening. Apprently it's the \frac command that's doing it, coupled with the way I crop inline images. (Inline images are cropped differently from display-mode images, so that they appear at the right location vertically). I'll have to do some more thorough experimenting next time I'm on the site. In the meantime, don't inline \frac I guess.

You can also inline it manual-style like this: $$\mbox{ \Large \frac{\mathbb{N}}{\mathbb{N}}=\mathbb{N} }$$. Doing so renders the image as inline-mode, but crops the image as display-mode (meaning it may not appear at the right position vertically). It works, but that's a bit ridiculous. I'll look into it next time I get the chance.

- Warren

 

[Hurkyl]

One should probably use $\mathbb{N}/\mathbb{N}$ style fractions in inline text anyways, but a bug is still a bug!

 

[vu3ogi]

Originally posted by Hurkyl
One should probably use $\mathbb{N}/\mathbb{N}$ style fractions in inline text anyways, but a bug is still a bug!

I agree with Hurkyl. fraction type $\frac{\mathbb{N}}{\mathbb{N}}=\mathbb{N}$ should only be used in equation ( or eqnarray), but while writing along with text we should use $\mathbb{N}/\mathbb{N}$

cheers,
Nagaraj
/**********************/
VU3OGI is my HAM callsign
/**********************/

 

[lethe]

any ideas why this isn t working?

$$\begin{multline*} \tan^n \theta=\tan^{n-2}\theta \tan^2 \theta\\ =\tan^{n-2}\theta(\sec^2\theta-1)=\tan^{n-2}\theta\sec^2\theta-\tan^{n-2}\theta \end{multline*}$$

 

[chroot]

Mainly because the environment is not called multiline, it's called multline (without the 'i'). Try this:

$$\begin{multline*} \tan^n \theta=\tan^{n-2}\theta \tan^2 \theta\\ =\tan^{n-2}\theta(\sec^2\theta-1)=\tan^{n-2}\theta\sec^2\theta-\tan^{n-2}\theta \end{multline*}$$

- Warren

 

[lethe]

Originally posted by chroot
Mainly because the environment is not called multiline, it's called multline (without the 'i'). Try this:

oops... i m an idiot.

thanks chroot.

 

[Hurkyl]

How do I make a script P, such as is typically used in the notation for a power set $P(X)$?

 

[Ambitwistor]

$$\mathcal{P}(X)$$

 

[mormonator_rm]

Hi folks!

I'm just setting up a practice spot for myself here. Don't mind me. These will be changing/dissappearing as I get new thoughts, but feel free to watch my struggles.

$$M^2 = \left( \begin{array}{cc} M^2_{11} & M^2_{18}\\ M^2_{18} & M^2_{88} \end{array} \right)$$

$$M^2_{88} = \frac {1}{3} \left(4m^2_{K} - m^2_{\pi}\right)$$

$$M^2_{11} = m^2_{\eta} + m^2_{\eta'} - M^2_{88}$$

$$M^2_{18} = - \sqrt{(M^2_{88} - m^2_{\eta})(m^2_{\eta'} - M^2_{88})}$$

$$\tan\theta_{P} = \frac {M^2_{88} - m^2_{\eta}}{M^2_{18}}$$

Dang this is freakin' cool!

$$\begin{multline*} \eta = \eta_{8}\cos\theta_{P} - \eta_{1}\sin\theta_{P}\\ \eta' = \eta_{8}\sin\theta_{p} + \eta_{1}\cos\theta_{P} \end{multline*}$$

$$\eta_{1} = \frac {u\bar{u} + d\bar{d} + s\bar{s}}{\sqrt{3}}, \eta_{8} = \frac {u\bar{u} + d\bar{d} - 2s\bar{s}}{\sqrt{6}}$$

I just can't stop...

$$\nu_e$$

$$\nu_e\bar$$

 

[jcsd]

$$\neq$$

What would be the symbol for 'not equivalent to' and how would you represent it in latex?

 

[jcsd]

Wouldn't it just be a crossed equivalent sign (or is that stronger than 'not equivalent to'?)? which I can't seem to get that anyway.

$$\nequiv \notequiv$$

 

[Ambitwistor]

$$\not\equiv$$

 

[jcsd]

thanks!

I was looking at a table of glyphs used in maths and it had that sign as 'not identical to' is that interchangable with 'not equivalent to' or can the sign mena both things?

 

[Ambitwistor]

The symbol can be read as either "identical" or "equivalent".

 

[Ambitwistor]

By the way, I never answered this...

Originally posted by chroot
Can you tell me why the font size is different between these two images?

$\int_{a}^{b}} e^x dx$

$e^x = \sum_{n=0}^\infty \frac{x^n}{n!} = \lim_{n\rightarrow\infty} (1+x/n)^n$

Look at the TeX for the first one: it has an extra closing curly brace }. Thus, since the TeX expression is being implicitly enclosed within \inline{...}, that extra brace closes the inline, and the e^x dx is not inlined.

You don't need the curly braces here anyway... it should just be $\int_a^b e^x\,dx$.

 

[phantomAI]

Wow this is awesome, but is there a sperate program or way that I can do the Math Typesetting offline or find it as a standard software? I would like to be able to type out some mathematical notes for my self since my hand writing is a bit sloppy and my notebook becomes incoherent...

 

[master_coda]

Originally posted by phnatomAI
Wow this is awesome, but is there a sperate program or way that I can do the Math Typesetting offline or find it as a standard software? I would like to be able to type out some mathematical notes for my self since my hand writing is a bit sloppy and my notebook becomes incoherent...

You can use MiKTeX if you use Windows. If you use Linux, your distro should already have TeX and LaTeX software.

 

[lovin_physics05]

im kinda slow, andim not that advanced, so I am tryin lil things. but i like this thing, ima be the only person in my class with a fully typed physics report.


$f_{x}=f\cos\theta$

 

[phantomAI]

Originally posted by master_coda
You can use MiKTeX if you use Windows. If you use Linux, your distro should already have TeX and LaTeX software.

I installed it but how do I use it? Do I just go to notepad and type up and save it as a .dvi file?

 

[futz]

Originally posted by phnatomAI
I installed it but how do I use it? Do I just go to notepad and type up and save it as a .dvi file?

You type it up in a regular text file, then save it with a .tex extension. Then, you need to compile it by typing "latex file" (no quotes, in Windows, at a DOS prompt, in the directory where the file is saved), where file.tex is the thing you just saved. This will generate a DVI file. With Miktex, you can then type "yap file", which opens the Yap DVI viewer.

Alternatively, you can output to a PDF file by typing "pdflatex file" at the prompt.

 

[chroot]

Unfortunately, LaTeX has a rather stiff learning curve.

Fortunately, there are 4.9 gabillion webpages to help you out. Just google around for some sample documents.

- Warren

 

[lethe]

can we make feynman diagrams?

$$\begin{fmfchar*}(40,25) \fmfleft{em,ep} \fmf{fermion}{em,Zee,ep} \fmf{photon,label=Z}{Zee,Zff} \fmf{fermion}{fb,Zff,f} \fmfright{fb,f}______ \fmfdot{Zee,Zff} \end{fmfchar*}$$