Introducing LaTeX Math Typesetting

[MathematicalPhysicist]

i have a question regarding tex, before tex was invented, how did scientists published equations through the internet?

 

[rpenner]

I am under the impression that typesetting software, like troff, predated both TeX and the internet. A quick survey of Google supports this clearly.

TeX was born in 1982, which was in the infancy of "The Internet" http://www.tug.org/ftp/historic/systems/unix/TeX2.9/tex82/TeXdoc/history.txt

For the early days of UNIX: The AT&T Man pages are typeset in nroff for terminals and troff for publishing. An additional utility, eqn, was a nroff preprocessor specific for equations. These have been around since the early 1970s.

http://ezine.daemonnews.org/199903/history.html

Prior to UNIX, in the 1960s, was CTSS which had RUNOFF which was an ancestor of VAX/VMS RUNOFF and UNIX troff, and GNU gtroff
http://mit.edu/Saltzer/www/publications/AH.9.01.html
http://www.multicians.org/thvv/7094.html

Prior to RUNOFF, there may have been a variety of custom (proprietrary) typesetting solutions used by published in the 1960's.

 

[buddyholly9999]

For the powerset fancy lettering I used calligra..found on this website
http://www.tug.dk/FontCatalogue/"

as for ultima9999...it might be just me...but did you mean to use 5^{10}
??

 

[Zeit]

Excuse me, I just want to try it a bit.

$$t=\frac{t_0}{\sqrt{1-\frac{v^2}{c^2}}}$$

 

[Pakistani_Shikra]

can anyone tell me how to use binomial in laTeX bcoz when i use \binom it doesn't comes up with anything except = mn
can anyone explain this to me ??

 

[Triss]

can anyone tell me how to use binomial in laTeX bcoz when i use \binom it doesn't comes up with anything except = mn
can anyone explain this to me ??

\binom{}{} requires the amsmath package.

 

[VietDao29]

can anyone tell me how to use binomial in laTeX bcoz when i use \binom it doesn't comes up with anything except = mn
can anyone explain this to me ??

You mean this:
$$\left( \begin{array}{c} n \\ k \end{array} \right)$$?

 

[VietDao29]

Testing:
$$\setlength{\unitlength}{6cm} \begin{picture}(1, 1) \put(0, 0){\line(0, 1){1}} \put(0, 0){\line(1, 0){1}} \put(0, 0){\line(1, 1){1}} \put(0, 0){\line(1, 2){.5}} \put(0, 0){\line(1, 3){.33333}} \put(0, 0){\line(1, 4){.25}} \put(0, 0){\line(1, 5){.2}} \put(0, 0){\line(1, 6){.16667}} \put(0, 0){\line(2, 1){1}} \put(0, 0){\line(2, 3){.6667}} \put(0, 0){\line(2, 5){.4}} \put(0, 0){\line(3, 1){1}} \put(0, 0){\line(3, 2){1}} \put(0, 0){\line(3, 4){.75}} \put(0, 0){\line(3, 5){.6}} \put(0, 0){\line(4, 1){1}} \put(0, 0){\line(4, 3){1}} \put(0, 0){\line(4, 5){.8}} \put(0, 0){\line(5, 1){1}} \put(0, 0){\line(5, 2){1}} \put(0, 0){\line(5, 3){1}} \put(0, 0){\line(5, 4){1}} \put(0, 0){\line(5, 6){.8333}} \put(0, 0){\line(6, 1){1}} \put(0, 0){\line(6, 5){1}} \end{picture}$$
$$\definecolor{hellgrau}{gray}{.8} \definecolor{dunkelblau}{rgb}{0, 0, .7} \definecolor{roetlich}{rgb}{1, .7, .7} \definecolor{dunkelmagenta}{rgb}{.3, 0, .3} \setlength{\unitlength}{1cm} \begin{picture}(6, 8) \linethickness{0.075mm} \multiput(0, 0)(6, 0){2}{\line(0, 1){8}} \multiput(0, 0)(0, 8){2}{\line(1, 0){6}} \thicklines \color{dunkelmagenta} \put(1, .5){\line(2, 1){3}} \put(4, 2){\line(-2, 1){2}} \put(2, 3){\line(-2, -5){1}} \put(.7, .3){\makebox(0,0)[cc]{B}} \put(4.05, 1.9){\makebox(0,0)[cc]{B}} \put(1.7, 2.95){\makebox(0,0)[cc]{C}} \put(3.1, 2.5){\makebox(0,0)[cc]{a}} \put(1.3, 1.7){\makebox(0,0)[cc]{b}} \put(2.5, 1.05){\makebox(0,0)[cc]{c}} \color{dunkelblau} \put(0.3, 4){\makebox(0,0)[cc]{F=\sqrt{s(s-a)(s-b)(s-c)}}} \end{picture}$$
$$\definecolor{cred}{rgb}{1, 0, 0} \definecolor{cgreen}{rgb}{0, 1, 0} \definecolor{cblue}{rgb}{0, 0, 1} \setlength{\unitlength}{1mm} \begin{picture}{60, 60} \put(30, 30){\circle{14}} \put(23, 23){\line(1, 0){14}} \put(23, 23){\line(0, 1){14}} \put(37, 37){\line(0, -1){14}} \put(37, 37){\line(-1, 0){14}} \color{cred} \put(30, 23){\line(0, 1){14}} \put(23, 30){\line(1, 0){14}} \end{picture}$$
This is driving me crazy... Does anyone know why there's a text 0, 60 in the third picture? I didn't put any text there, it just appeared mysteriously...
The circle command is too small, since the diameter can only be 14 mm. I just wonder if there is a way to magnify the picture? Or to draw a larger circle?

 

[J77]

This is driving me crazy... Does anyone know why there's a text 0, 60 in the third picture? I didn't put any text there, it just appeared mysteriously...

Your \begin{picture} command has curly brackets after it {60,60} instead of round (60,60)

 

[VietDao29]

Your \begin{picture} command has curly brackets after it {60,60} instead of round (60,60)

Ah, yes, thanks a lot. Sometimes, I just mess up the round bracket, and the curly ones.

 

[VietDao29]

$$\frac{\pi ^2^2^2}{\log \cos \sin \tan$$

You forgot to type in the '}' at the end.
$$\frac{\pi ^2^2^2}{\log \cos \sin \tan }$$

 

[Water]

I'm having trouble trying to write mass times specific heat times delta T subscript copper to represent the internal energy of a piece of copper. This was one of my many unsuccessful attempts:

$$mc /Delta T_{copper}$$

How do you do it?

Testing: $$mc \partial_{x}$$. I hope the mc part appears. (Edit: Guess it didn't)

 

[robphy]

I'm having trouble trying to write mass times specific heat times delta T subscript copper to represent the internal energy of a piece of copper. This was one of my many unsuccessful attempts:

$$mc /Delta T_{copper}$$

How do you do it?

Use \Delta
$$mc \Delta T_{copper}$$ <---click me

 

[Hyperreality]

Feynman Diagram

Does anyone know how to use the Feynman diagram package in LaTex??

My Miktex has this "feynmf macros", how do I use it??

 

[sylas]

I am wanting to preview a post containing tex. But the preview tells me that it is being generated, and when I refresh to see the result, it then restarts the generation process.

I think.

Is there any way I can preview my tex before posting?

Thanks -- Sylas.

PS. I was trying to enter this:

$$\frac{\partial f}{\partial x} = \gamma \\ \frac{\partial f}{\partial t} = \omega c \\ \frac{\partial g}{\partial x} = \omega/c \\ \frac{\partial g}{\partial t} = \gamma \\ \gamma = ...$$

 

[robphy]

I am wanting to preview a post containing tex. But the preview tells me that it is being generated, and when I refresh to see the result, it then restarts the generation process.

I think.

Is there any way I can preview my tex before posting?

Thanks -- Sylas.

Unfortunately, it seems that wonderful feature was broken in an upgrade.

 

[mbrmbrg]

here is inline text $x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$
and normal latex$$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$$

lately the computer hasn't differentiated.

 

[mbrmbrg]

Ooh, look! itex uses littler font but still the white background!

 

[oen_maclaude]

i guess there is something wrong in the pdf file in
https://www.physicsforums.com/misc/howtolatex.pdf

it should be /tex not \tex

 

[mbrmbrg]

i guess there is something wrong in the pdf file in
https://www.physicsforums.com/misc/howtolatex.pdf

it should be /tex not \tex

This post rather befuddled me, b/c I learned from that file and never had a problem...
Then I saw it--
although [ t e x ]...[ / t e x ] does appear twice., [ t e x ]...[ \ t e x ] appears once.
It's all in what you look for !

BTW, can anyone explain the itex $\frac{7 days}{1 week}$ vs tex $$\frac{7 days}{1 week}$$ deal?

 

[oen_maclaude]

This post rather befuddled me, b/c I learned from that file and never had a problem...
Then I saw it--
although [ t e x ]...[ / t e x ] does appear twice., [ t e x ]...[ \ t e x ] appears once.
It's all in what you look for !

BTW, can anyone explain the itex $\frac{7 days}{1 week}$ vs tex $$\frac{7 days}{1 week}$$ deal?

i guess it is better for articles to be consistent. just a thought. Anyway, thanks!

 

[Triss]

i guess it is better for articles to be consistent. just a thought. Anyway, thanks!

When you write articles, reports and such, you take much more advantage of latex than the forum does. here its just a mean to write readable mathematics. So what 'itex' tries to do is to mimic standard inline math ($ $) and 'tex' looks more like displaystyle math (\[ \]).

 

[mbrmbrg]

Hm. I thought itex was supposed to get rid of the white background, possibly w/o shrinking the font size. Then again, if it's to make it fit the line, of course a fraction has to be shrunk (shrunken?).

 

[MathematicalPhysicist]

spot the error.

hi, I am using texniccenter, and i would appreciate if someone could sopt my errors in my code, and help me correct it.
here's the code:
\begin{normalsize}
\begin{document}
\begin{equation}
\normalsize
m\int\limits_{x_1}^{x_2}
\frac{dv}{dt}dx=\int\limits_'{x_1}^{x_2}F(x)dx
\nonumber\\
dx=\frac{dx}{dt}dt=vdt
\nonumber\\
m\int\limits_{x_1}^{x_2}\frac{dv}{dt}dx=m\int\limits_{t_1}^{t_2}\frac{dv}{dt}vdt
\nonumber\\
=\int\limits_{t_1}^{t_2}\frac(d}{dt}
(\frac{1}{2}v^2)dt=\frac{1}{2}m[v_2^2-v_1^2]
\end{equation}
\end{document}
\end{normalsize}

 

[Triss]

hi, I am using texniccenter, and i would appreciate if someone could sopt my errors in my code, and help me correct it.
here's the code:
\begin{normalsize}
\begin{document}
\begin{equation}
\normalsize
m\int\limits_{x_1}^{x_2}
\frac{dv}{dt}dx=\int\limits_'{x_1}^{x_2}F(x)dx
\nonumber\\
dx=\frac{dx}{dt}dt=vdt
\nonumber\\
m\int\limits_{x_1}^{x_2}\frac{dv}{dt}dx=m\int\limits_{t_1}^{t_2}\frac{dv}{dt}vdt
\nonumber\\
=\int\limits_{t_1}^{t_2}\frac(d}{dt}
(\frac{1}{2}v^2)dt=\frac{1}{2}m[v_2^2-v_1^2]
\end{equation}
\end{document}
\end{normalsize}

It does not matter what program you used. If it will not compile it will not compile no matter the program you are useing.

First of all, *never* put any enviroments around, or outside your main document -- just doesn't work. \normalsize also does nothing for you in a math enviroment. a few other errors where in how you used \limits and \frac{}{}. The following compiles nicely

\documentclass{article}

%\begin{normalsize}
\begin{document}
\begin{equation}
%\normalsize
m\int\limits_{x_1}^{x_2}
\frac{dv}{dt}dx=\int\limits_{x_1}^{x_2}F(x)dx %removed '
\nonumber\\
dx=\frac{dx}{dt}dt=vdt
\nonumber\\
m\int\limits_{x_1}^{x_2}\frac{dv}{dt}dx=m\int\limits_{t_1}^{t_2}\frac{dv}{dt}vdt
\nonumber\\
=\int\limits_{t_1}^{t_2}\frac{d}{dt} %corrected ( => {
(\frac{1}{2}v^2)dt=\frac{1}{2}m[v_2^2-v_1^2]
\end{equation}
\end{document}
%\end{normalsize}

 

[HalfManHalfAmazing]

$$\oint E\cdot dA = \frac{Q_{enc}}{\epsilon_0}$$

Yahoo! Finally produced Gauss' Law in latex!

 

[Hootenanny]

Latex Transparency fixed in IE7

 

[Orion1]

The circle command is too small, since the diameter can only be 14 mm. I just wonder if there is a way to magnify the picture? Or to draw a larger circle?

$$\] \unitlength 0.02mm \begin{picture}(4000,4000)(0,0) \linethickness{3pt} \textcolor{red}{ \qbezier( 4000, 2000)( 3996, 2125)( 3984, 2250) \qbezier( 3984, 2250)( 3964, 2374)( 3937, 2497) \qbezier( 3937, 2497)( 3902, 2618)( 3859, 2736) \qbezier( 3859, 2736)( 3809, 2851)( 3752, 2963) \qbezier( 3752, 2963)( 3688, 3071)( 3618, 3175) \qbezier( 3618, 3175)( 3541, 3274)( 3457, 3369) \qbezier( 3457, 3369)( 3369, 3457)( 3274, 3541) \qbezier( 3274, 3541)( 3175, 3618)( 3071, 3688) \qbezier( 3071, 3688)( 2963, 3752)( 2851, 3809) \qbezier( 2851, 3809)( 2736, 3859)( 2618, 3902) \qbezier( 2618, 3902)( 2497, 3937)( 2374, 3964) \qbezier( 2374, 3964)( 2250, 3984)( 2125, 3996) \qbezier( 2125, 3996)( 1999, 4000)( 1874, 3996) \qbezier( 1874, 3996)( 1749, 3984)( 1625, 3964) \qbezier( 1625, 3964)( 1502, 3937)( 1381, 3902) \qbezier( 1381, 3902)( 1263, 3859)( 1148, 3809) \qbezier( 1148, 3809)( 1036, 3752)( 928, 3688) \qbezier( 928, 3688)( 824, 3618)( 725, 3541) \qbezier( 725, 3541)( 630, 3457)( 542, 3369) \qbezier( 542, 3369)( 458, 3274)( 381, 3175) \qbezier( 381, 3175)( 311, 3071)( 247, 2963) \qbezier( 247, 2963)( 190, 2851)( 140, 2736) \qbezier( 140, 2736)( 97, 2618)( 62, 2497) \qbezier( 62, 2497)( 35, 2374)( 15, 2250) \qbezier( 15, 2250)( 3, 2125)( 0, 1999) \qbezier( 0, 1999)( 3, 1874)( 15, 1749) \qbezier( 15, 1749)( 35, 1625)( 62, 1502) \qbezier( 62, 1502)( 97, 1381)( 140, 1263) \qbezier( 140, 1263)( 190, 1148)( 247, 1036) \qbezier( 247, 1036)( 311, 928)( 381, 824) \qbezier( 381, 824)( 458, 725)( 542, 630) \qbezier( 542, 630)( 630, 542)( 725, 458) \qbezier( 725, 458)( 824, 381)( 928, 311) \qbezier( 928, 311)( 1036, 247)( 1148, 190) \qbezier( 1148, 190)( 1263, 140)( 1381, 97) \qbezier( 1381, 97)( 1502, 62)( 1625, 35) \qbezier( 1625, 35)( 1749, 15)( 1874, 3) \qbezier( 1874, 3)( 1999, 0)( 2125, 3) \qbezier( 2125, 3)( 2250, 15)( 2374, 35) \qbezier( 2374, 35)( 2497, 62)( 2618, 97) \qbezier( 2618, 97)( 2736, 140)( 2851, 190) \qbezier( 2851, 190)( 2963, 247)( 3071, 311) \qbezier( 3071, 311)( 3175, 381)( 3274, 458) \qbezier( 3274, 458)( 3369, 542)( 3457, 630) \qbezier( 3457, 630)( 3541, 725)( 3618, 824) \qbezier( 3618, 824)( 3688, 928)( 3752, 1036) \qbezier( 3752, 1036)( 3809, 1148)( 3859, 1263) \qbezier( 3859, 1263)( 3902, 1381)( 3937, 1502) \qbezier( 3937, 1502)( 3964, 1625)( 3984, 1749) \qbezier( 3984, 1749)( 3996, 1874)( 4000, 1999) } \end{picture} \[$$

$$\] \unitlength 0.02mm \begin{picture}(4000,4000)(0,0) \linethickness{3pt} \textcolor{blue}{ \qbezier( 4000, 2000)( 3996, 2125)( 3984, 2250) \qbezier( 3984, 2250)( 3964, 2374)( 3937, 2497) \qbezier( 3937, 2497)( 3902, 2618)( 3859, 2736) \qbezier( 3859, 2736)( 3809, 2851)( 3752, 2963) \qbezier( 3752, 2963)( 3688, 3071)( 3618, 3175) \qbezier( 3618, 3175)( 3541, 3274)( 3457, 3369) \qbezier( 3457, 3369)( 3369, 3457)( 3274, 3541) \qbezier( 3274, 3541)( 3175, 3618)( 3071, 3688) \qbezier( 3071, 3688)( 2963, 3752)( 2851, 3809) \qbezier( 2851, 3809)( 2736, 3859)( 2618, 3902) \qbezier( 2618, 3902)( 2497, 3937)( 2374, 3964) \qbezier( 2374, 3964)( 2250, 3984)( 2125, 3996) \qbezier( 2125, 3996)( 1999, 4000)( 1874, 3996) \qbezier( 1874, 3996)( 1749, 3984)( 1625, 3964) \qbezier( 1625, 3964)( 1502, 3937)( 1381, 3902) \qbezier( 1381, 3902)( 1263, 3859)( 1148, 3809) \qbezier( 1148, 3809)( 1036, 3752)( 928, 3688) \qbezier( 928, 3688)( 824, 3618)( 725, 3541) \qbezier( 725, 3541)( 630, 3457)( 542, 3369) \qbezier( 542, 3369)( 458, 3274)( 381, 3175) \qbezier( 381, 3175)( 311, 3071)( 247, 2963) \qbezier( 247, 2963)( 190, 2851)( 140, 2736) \qbezier( 140, 2736)( 97, 2618)( 62, 2497) \qbezier( 62, 2497)( 35, 2374)( 15, 2250) \qbezier( 15, 2250)( 3, 2125)( 0, 1999) \qbezier( 0, 1999)( 3, 1874)( 15, 1749) \qbezier( 15, 1749)( 35, 1625)( 62, 1502) \qbezier( 62, 1502)( 97, 1381)( 140, 1263) \qbezier( 140, 1263)( 190, 1148)( 247, 1036) \qbezier( 247, 1036)( 311, 928)( 381, 824) \qbezier( 381, 824)( 458, 725)( 542, 630) \qbezier( 542, 630)( 630, 542)( 725, 458) \qbezier( 725, 458)( 824, 381)( 928, 311) \qbezier( 928, 311)( 1036, 247)( 1148, 190) \qbezier( 1148, 190)( 1263, 140)( 1381, 97) \qbezier( 1381, 97)( 1502, 62)( 1625, 35) \qbezier( 1625, 35)( 1749, 15)( 1874, 3) \qbezier( 1874, 3)( 1999, 0)( 2125, 3) \qbezier( 2125, 3)( 2250, 15)( 2374, 35) \qbezier( 2374, 35)( 2497, 62)( 2618, 97) \qbezier( 2618, 97)( 2736, 140)( 2851, 190) \qbezier( 2851, 190)( 2963, 247)( 3071, 311) \qbezier( 3071, 311)( 3175, 381)( 3274, 458) \qbezier( 3274, 458)( 3369, 542)( 3457, 630) \qbezier( 3457, 630)( 3541, 725)( 3618, 824) \qbezier( 3618, 824)( 3688, 928)( 3752, 1036) \qbezier( 3752, 1036)( 3809, 1148)( 3859, 1263) \qbezier( 3859, 1263)( 3902, 1381)( 3937, 1502) \qbezier( 3937, 1502)( 3964, 1625)( 3984, 1749) \qbezier( 3984, 1749)( 3996, 1874)( 4000, 1999) } \thicklines {\color{red}\put(2000, 2000){\vector(1, 0){2000}}} {\color{orange}\put(2000, 2000){\vector(4, 1){1000}}} {\color{yellow}\put(2000, 2000){\vector(3, 1){1500}}} {\color{green}\put(2000, 2000){\vector(2, 1){2000}}} {\color{blue}\put(2000, 2000){\vector(1, 2){500}}} \thicklines \put(2000, 2000){\vector(-4, 1){2000}} \put(2000, 2000){\vector(-1, 4){500}} \thinlines \put(2000, 2000){\vector(-1, -1){500}} \put(2000, 2000){\vector(-1, -4){500}} \end{picture} \[$$

 

[kingyof2thejring]

$$\alpha^2\sin(x)$$

 

[kingyof2thejring]

$$(E_0-E_1+mc^2)^2=E^2_0+E^2_1 -2E_0E_1cos\theta +(mc^2)^2$$
$$E^2_0- 2E_0E_1 +2E_0mc^2+E^2_1-2E_1mc^2 +m^2c^4=E^2_0+E^2_1 -2E_0E_1cos\theta +(mc^2)^2$$
$$2E_0mc^2-2E_1mc^2=-2E_0E_1cos\theta+2E_0E_1$$
$$2mc^2(E_0-E_1)=2E_0E_1(1-cos\theta)$$

$$E=E_0-E_1+mc^2$$ $$c^2p^2=E^2_0+E^2_1 -2E_0E_1cos\theta$$
$$E^2=c^2p^2+(mc^2)^2$$

 

[kingyof2thejring]

$$mc^2(\frac{hc}{\lambda_0}-\frac{hc}{\lambda_1})=\frac{hc}{\lambda_0}\frac{hc}{\lambda_1}(1-cos\theta)$$
$$hmc^3(\frac{1}{\lambda_0}-\frac{1}{\lambda_1})=\frac{h^2c^2}{\lambda_0\lambda_1}(1-cos\theta)$$
$$\lambda_0\lambda_1(\frac{1}{\lambda_0}-\frac{1}{\lambda_1})=\frac{h^2c^2}{hmc^3}(1-cos\theta)$$
$$\lambda_1-\lambda_0=\frac{h}{mc}(1-cos\theta)$$

$$E_0=hf_0$$ $$f_0=\frac{c}{\lambda_0}$$
$$E_1=hf_1$$ $$f_1=\frac{c}{\lambda_1}$$

 

[Divisionbyzer0]

$$\oint E\cdot dA = \frac{Q_{enc}}{\epsilon_0}$$

Yahoo! Finally produced Gauss' Law in latex!

This would be better :

$\oint_\mathcal{S} \mathbf{E} \cdot d\mathbf{A} = \frac{Q_\textrm{enc}}{\epsilon_0}$​

 

[b2386]

Hi all,

Here is my question:

In the $$E>U_0$$ potential barrier, there should be no reflected wave when the incident wave is at one of the transmisson resonances. Assuming that a beam of particles is incident at the first transmission resonance, $$E=U_0+(\frac{\pi^2 h^2}{2mL^2})$$, combine the continuity conditions to show that B=0. Here are the continuity conditions:

1st $$A+B=C+D$$

2nd $$k(A- B)=k^{'}(C-D)$$

3rd $$Ce^{ik^{'}L}+De^{-ik^{'}L}=Fe^{ikL}$$

4th $$k^{'}(Ce^{ik^{'}L}-De^{-ik^{'}L})=kFe^{ikL}$$

A couple more equations that we already know are $$k=\sqrt{\frac{2mE}{h^2}}$$ and $$k^'=\sqrt{\frac{2m(E-U_0)}{h^2}$$

Here is my attempted solution:

I divided the 4th equation by K and then set equation 3 and 4 equal to each other. I then used the new equation to solve for C in terms of D giving me

$$C=De^{-2i \pi}\frac{k^{'}+k}{k^{'}-K}$$ where I substituted $$\frac{\pi}{L}$$ in for k'.

I substituted this result into the first equation to now give me

$$A+B={De^{-2i \pi}\frac{k^{'}+k}{k^{'}-K} + D$$.

Solving for D gives me

$$\frac{A+B}{e^{-2i \pi}\frac{k^{'}+k}{k^{'}-K} + 1} = D$$

Now, plugging in our solutions for D and C into the 2nd equation

$$\frac{(A+B)e^{-2i \pi}\frac{k^{'}+k}{k^{'}-K}}{e^{-2i \pi}\frac{k^{'}+k}{k^{'}-K}+1}-\frac{A+B}{e^{-2i \pi}\frac{k^{'}+k}{k^{'}-K}+1}=\frac{k}{k^{'}}(A-B})$$

At this point, it seems impossible to simplify the equation to a point where it is obvious that B = 0. Am I on the right track or is there an easier way?

 

[Couperin]

$$17(1-\frac{1}{17^2})^\frac{1}{2}$$

Does anyone know of a website that allows me to use tex code and generate latex graphics, that isn't necessarily part of a forum like this one?

BTW, the guy who coded LaTeX into this forum is a bloody wizard.

EDIT: God! LaTeX is amazing! I've been checking the examples in this thread... what an invention!

 

[Couperin]

Found one here: http://at.org/~cola/tex2img/index.php

(sorry for double post, I can't find the EDIT button...)