The Sandbox

Ever tried to tell someone how to use a particular bit of BB code, and had to tell them something like "remove the spaces to make the tags work"? Then you'll have probably given up and gone for a cigarette when they said "what spaces?" VB includes a tag called noparse which you can use for displaying BB code as normal text. Any BB code enclosed by the noparse tags will be ignored when the post is parsed and rendered to the browser. So, for example, if I take this... Bold text ...and surround it with noparse tags... Bold text ...you will see this: Bold text Try it out!

Tags are a relatively new feature on vBulletin forums, and from looking at the tags which have been added to threads so far it looks like a short tutorial might be needed. What are Tags? Tags are metadata keywords. This means that they are data about data, in other words they describe content. Why use Tags? Tags have several functions: They let members and search engines find content by keyword, They give a brief overview as to what the main subject of content is about, They allow content to be ordered into related subjects, They can show how popular a subject is. How should Tags be entered? When you start a thread, you can add tags t…

How can I start a poll on this site? I thought it might be useful to get the opinions of the community. Are there any special rules for polls? Am I allowed to ask about religion, political standing, and other sort of touchy subjects? Thanks.

1c2∂2ψ∂t2−∂2ψ∂x2−∂2ψ∂y2−∂2ψ∂z2=−m2c2ℏ2ψ Let ψ=ψ0exp(iS(t,x,y,z)ℏ) ∂2ψ∂t2=∂∂t(∂∂texp(iS(t,x,y,z)ℏ)) \[\frac{\partial^2\psi}{\partial t^2} = \psi_0 \frac{\partial}{\partial t}(\frac{\partial}{\partial t} exp(i\frac{S(t,x,y,z)}{\hbar})) = \psi_0 \frac{\partial}{\partial t}(\frac{i}{hbar} exp(i\frac{S(t,x,y,z)}{\hbar}) \frac{\partial S(t,x,y,z)}{\partial t})\]

(I am testing latex, but no porn here) test1... [math]a[/math] test2... [math]{a}[/math] test3... [math]123a[/math] test4... [math]123.45\cdot a[/math] test5... [math]123.45\cdota[/math] test 6... [math]123,45a[/math] test7... [math]abc[/math] test8... [math]a \cdot b \cdot c[/math] test9... [math]a_b[/math] test10... [math]{a}_{b}[/math] test11... [math]a_{b}^{c}[/math] test12... [math]{abc}_{d ef}[/math] test 13... [math]a b /c[/math] (PN: not enoguh space between variables 'a' and 'b') test14... [math]a _{b }+3.1 \cdot {10 }^{-12}[/math] (PN: minus…

finding acceptable double arrows for chemical equations [math]Fe{\left( {OH} \right)_3} \Leftrightarrow F{e^{3 + }} + 3{\left( {OH} \right)^ - }[/math] [math]Fe{\left( {OH} \right)_3} \leftrightarrow F{e^{3 + }} + 3{\left( {OH} \right)^ - }[/math] [math]Fe{\left( {OH} \right)_3} \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} F{e^{3 + }} + 3{\left( {OH} \right)^ - }[/math]

L=1/γ=1−v2−−−−−√ dL/dt=−γva=vn+1−vn ∂v/∂n=(vn+1−vn)/1=−γva H_z=H_o\sqrt{\Omega_m(1+z)^3+\Omega_{rad}(1+z)^4+\Omega_{\Lambda}} [math] H_z=H_o\sqrt{\Omega_m(1+z)^3+\Omega_{rad}(1+z)^4+\Omega_{\Lambda}} [/math] av

I've noticed my tex stuff is overcramped when displayed, these days so I'm finding out how to make it bigger. [math]{P_{n = 3}} = \left\{ {1 - {{\left( {\frac{5}{6}} \right)}^3}} \right\} = \left\{ {1 - \left( {\frac{{125}}{{216}}} \right)} \right\} = \frac{{91}}{{216}}[/math] It comes out bigger on my TEX editor, but is cut back here Any suggestions?

Material Safety Data Sheet (MSDS) for Sodium lauryl sulfate gives the following information: Section 11: Toxicological Information WARNING: THE LC50 VALUES HEREUNDER ARE ESTIMATED ON THE BASIS OF A 4-HOUR EXPOSURE. Acute oral toxicity (LD50): 1288 mg/kg [Rat.]. Acute toxicity of the dust (LC50): >3900 mg/m 1 hours [Rat]. 3MUTAGENIC EFFECTS: Mutagenic for bacteria and/or yeast. May cause damage to the following organs: skin.Hazardous in case of skin contact (irritant), of ingestion, of inhalation. Slightly hazardous in case of skin contact (sensitizer).Special Remarks on Toxicity to Animals:Lowest Published Lethal Dose: LDL [Rabbit] - Route: Skin; Dose: 1000…

http://www.youtube.c...h?v=n9KaI5T0zRw Hooray! Now to see if I can get the two in the one post. http://www.youtube.com/watch?v=n9KaI5T0zRw Seems that two in the one post broke it.

\[\frac{\Delta y}{\Delta x} = \frac{f(x+h)- f(x)}{h}\] \[\Delta y \] \[ y = \int f(x) dx \]

[math] m\left(\sqrt{(x - j)^2 + (y - k)^2}\right) = n\left(\sqrt{(x - r)^2 + (y - s)^2}\right) [/math] get rid of roots [math] m^2\left((x - j)^2 + (y - k)^2\right) = n^2\left((x - r)^2 + (y - s)^2\right) [/math] multiply out brackets [math] m^2\left((x^2-2jx+j^2) + (y^2-2ky+k^2)\right) = n^2\left((x^2-2rx+r^2) + (y^2-2sy+s^2)\right) [/math] multiply through [math] m^2x^2-2m^2jx+m^2j^2 + m^2y^2-2m^2ky+m^2k^2 = n^2x^2-2n^2rx+n^2r^2 + n^2y^2-2n^2sy+n^2s^2 [/math] gather like terms [math] m^2x^2 - n^2x^2 + m^2y^2 - n^2y^2 -2m^2jx +2n^2rx -2m^2ky +2n^2sy = +n^2r^2 +n^2s^2 - m^2k^2 - m^2j^2[/math] factorise a bit [math] (m^2 - n^2)x^2 + (m^2 - n^2)y^2 -x(2m^2j -2n^2r…

diff comp I hope it doesn't merge again It did

Just trying [math] for the first time... (Vfy)^2=(VisinΘ)^2+2ay⋅Δy [math] V_{fy}^{2} = V*sin( \phi )^{2}*2a_{y}* \Delta _{y}[/math]

[math] \sqrt{x} [/math]

Post number 1 - Submit

\int_a^{\infty} f(x)dx=\lim_{L\to\infty}\int_a^{L}f(x)dx

Typing f(x) = 0 within the LaTeX brackets produces \( f(x) = 0\) whereas typing f(x) := 0 leads to \( f(x) := 0.\) Is that something fixable, or one just has to be aware of it?

You all probably know about the consecutive post merger already, which combines consecutive posts in a thread if they come from the same member. Sometimes knowing where one post ends and another begins would be helpful. So is this better? Wait for it... Merged post follows: Consecutive posts mergedHere's my second post in this thread Previously, there was no indication in the merged post as to where the original post ended and the subsequent post began.

\[7={\color{red}1}\times2^{2}+{\color{red}1}\times2^{1}+{\color{red}1}\times2^{0}={\color{red}111}\] \[7={\color{red}1}\times2^{2}+{\color{red}1}\times2^{1}+{\color{red}1}\times2^{0}={\color{red}1}{\color{red}1}{\color{red}1}\]

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help button suggests these tags for LaTeX... [latex...] [latex]y = \sqrt{4x^2}[/latex] a thread gives these tags... [math...] [math]y = \sqrt{4x^2} [/math] edit: turns out both work

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Very Special Relativity SRN=Special (..) Relatively New We (can) use the (kinetic energy) KE=m*((v1^2)-(v0^2))/2 for mass m with final_speed v1 (gained) from initial_speed v0 ((is) set to the) ether's (light) speed c to find the (ether's (mass's)) kinetic energy KEo=m*((v1^2)-(c^2))/2 i.e. with respect to (wrt) the ether. The final speed v1 is the speed (that was) lost (wrt the ether, although gained by us.) That is now, all in absolute coordinates. The ether (coordinates). Commonly wrongly known as the rest mass energy (from Einstein & others). It is simply the (kinetic) energy the ether has to offer. An energy lost when…

Tried to insert Tex formula, but without success. Sorry, but how to write here tex formulas and how to delete topic? n \in N