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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 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
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  5. Started by studiot,

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

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    • 1 reply
    • 149 views
    • 1 follower
  6. Started by Externet,

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    • 1 reply
    • 143 views
    • 1 follower
  7. Started by Ghideon,

    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]

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    • 18 replies
    • 6.1k views
    • 2 followers
  8. 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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  9. Started by Genady,

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

  10. Started by Genady,

    deleted

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    • 11 replies
    • 3.9k views
  11. 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
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  12. 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
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  13. Started by Genady,

    image test

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    • 1 reply
    • 1k views
  14. Started by Passenger,

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    • 5 replies
    • 2.8k views
  15. Started by Mordred,

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

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    • 2 replies
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    • 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
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    • 2 followers
  17. Started by Markus Hanke,

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

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    • 0 replies
    • 1k views
    • 1 follower
  18. 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
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    • 2 followers
  19. 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. 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
    • 1.4k views
    • 1 follower
  21. Started by JacobNewton,

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    • 1 reply
    • 940 views
    • 1 follower
  22. Started by Externet,

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

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    • 0 replies
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  23. Started by Curious layman,

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

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    • 19 replies
    • 7.3k views
    • 1 follower
  24. Started by t686,

    test

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    • 8 replies
    • 3.3k views
    • 1 follower
  25. Started by Phi for All,

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

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