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The Sandbox

This forum is provided for members to test BB code, learn how to use the various forum functions, and generally get to grips with the system. All options are turned on, but posts do not count towards your total.

  1. Started by Sayonara,

    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!

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  2. Started by Sayonara,

    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…

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  3. Started by Mordred,

    \[\frac{1}{2}\]

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    • 0 replies
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  4. Started by studiot,

    [math]d:X \times X \to {\Re ^ + } \cup \{ 0\} [/math]

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    • 1 reply
    • 189 views
    • 1 follower
  5. Started by Externet,

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    • 1 reply
    • 165 views
    • 1 follower
  6. Started by Mordred,

    \displaystyle{\not}\partial \[\displaystyle{\not}\partial\] if anyone knows a way to make the Feymann slash more visible I would appreciate it greatly

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    • 6 replies
    • 957 views
  7. Started by Genady,

    deleted

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    • 11 replies
    • 4k views
  8. Started by Genady,

    \[\phi(x) \rightarrow \phi(x+\xi)=\phi(x)+\xi^{\nu} \partial_{\nu} \phi(x) + ...\] \[\frac {\delta \phi} {\delta \xi^{nu}} = \partial_{\nu} \phi\] \[\frac {\delta \mathcal L} {\delta \xi^{nu}} = \partial_{\nu} \mathcal L\] \[\frac {\delta \mathcal L[\phi, \partial_{mu} \phi]} {\partial \xi^{\nu}}=\partial_{mu} (\frac {\partial \mathcal L}{\partial (\partial_{mu} \phi)} \frac {\delta \phi} {\delta \xi^{nu}})\]

  9. Started by Schindelbeck,

    testing [math]\psi\Psi[/math] [math]W_n / W_{ref} = (y_l^m)^{-1/3} \Pi_{k=0}^n\alpha_0^{ (-1/3^k)}[/math]

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    • 5 replies
    • 1.5k views
    • 1 follower
  10. Started by KJW,

    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)) \[\frac{\partial^2\psi}{\partial t^2} = \psi_0 \frac{\partial}{\partial t}(\frac{\partial}{\partial t} exp(i\frac{S(t,x,y,z)}{\hbar})) = \psi_0 \frac{\partial}{\partial t}(\frac{i}{hbar} exp(i\frac{S(t,x,y,z)}{\hbar}) \frac{\partial S(t,x,y,z)}{\partial t})\]

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    • 43 replies
    • 4.1k views
  11. Started by Genady,

    image test

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    • 1 reply
    • 1.1k views
  12. Started by Mordred,

    abc \[ G^{\mu\nu}\] test abc \(G^{\mu\nu}\) trst

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    • 2 replies
    • 1.5k views
    • 1 follower
  13. Started by Markus Hanke,

    \[B_{\nu }^{\mu } \ vs\ B{_{\nu }}^{\mu } \ vs\ B{^{\mu}}_{\nu}\]

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    • 0 replies
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    • 1 follower
  14. Started by JacobNewton,

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    • 1 reply
    • 968 views
    • 1 follower
  15. Statistics say that a good portion of the known universe are ignorant of the fundementals of science. Therefore, it's important to spread science like a blanket of enlightenment across the seven seas. I propose a science podcast to this effect. I can host it/produce it, if you are willing to handle sponsorships. I even designed a cover photo for said podcast:

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    • 7 replies
    • 1.5k views
    • 1 follower
  16. Started by Lorentz Jr,

    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

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    • 27 replies
    • 4.5k views
    • 2 followers
  17. Started by Externet,

    Handset symbol 📞 📞 📡 📡 In 'utilities' as 'characters' - 'objects'

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    • 0 replies
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  18. Started by Phi for All,

    Well, if this is what the OP was talking about, then grabbing the tab on the quote works.

  19. Started by Lissamu,

    My stomach is slightly darker on the left half and does a strange dip going towards my sid before fading in. I'm only 16 and I've had it for a few years but have no idea what it is.

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    • 1 reply
    • 1.6k views
    • 1 follower
  20. Started by StringJunky,

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    • 1 reply
    • 1.7k views
  21. Started by joigus,

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

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    • 11 replies
    • 3.1k views
  22. Started by John2020,

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

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    • 20 replies
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  23. Started by zkutch,

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

  24. Started by studiot,

    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]

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    • 27 replies
    • 4.8k views
    • 2 followers
  25. Started by taeto,

    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?

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    • 12 replies
    • 2.7k views
    • 1 follower

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