Daecon Posted July 20, 2005 Share Posted July 20, 2005 *sigh* There's always someone waiting to bring down the tone of the place... ;-) Link to comment Share on other sites More sharing options...
MetaFrizzics Posted July 28, 2005 Share Posted July 28, 2005 [math] 4\pi r^2 = 2(\pi r(2r)) [/math] Surface of a Sphere = Surface of Cylinder of equal radius and height. AND, any slice of a sphere between two parallel planes has the same area as a cylinder the same height with a radius equal to the original sphere. Link to comment Share on other sites More sharing options...
ed84c Posted July 28, 2005 Share Posted July 28, 2005 Girls=Evil etc etc I like that equation the best Link to comment Share on other sites More sharing options...
VikingF Posted July 28, 2005 Share Posted July 28, 2005 6: ultraviolet voodoo! Not that hard to explain. We know that: [uv]' = u'v+uv' If we take the integral on both sides, we get: int([uv]')dx = int(u'v)dx + int(uv')dx (assumes that x is the variable in the equation) int([uv]')dx = uv, so: uv = int(u'v)dx + int(uv')dx The sollutions are then: (1): int(u'v)dx = uv - int(uv')dx, and (2): int(uv')dx = uv - int(u'v)dx Not more woodoo than that. Link to comment Share on other sites More sharing options...
TheGeek Posted August 1, 2005 Share Posted August 1, 2005 god, as always, e=mc2 gets the votes simply because people recognize it better I do agree with that to some extent. One of the reasons that people recognize it better is because it is a very important equation. Link to comment Share on other sites More sharing options...
PhDP Posted August 1, 2005 Share Posted August 1, 2005 [math] e^{i\pi} = -1 [/math] ...and [math] 1 = \int_{\alpha}^{\rho} e^{-rx}m(x)l(x)dx [/math] It's an equation so simple but so usefull in evolutionary ecology. Link to comment Share on other sites More sharing options...
theorein Posted February 13, 2006 Share Posted February 13, 2006 What's your favorite equation from chemistry/physics/mathematics? If yours isn't listed' date=' choose other and reply with it![/quote'] This equation has the answer to GRAVITY and Cold Fusion theorein Link to comment Share on other sites More sharing options...
ecoli Posted February 13, 2006 Share Posted February 13, 2006 I'm a fan of Henderson-Hesselbach. Link to comment Share on other sites More sharing options...
Severian Posted February 13, 2006 Share Posted February 13, 2006 [math]{\cal L} = \bar \psi \left( i \gamma^{\mu} \partial_{\mu} -m \right) \psi - \frac{1}{4} F^{\mu \nu}F_{\mu \nu} [/math] Link to comment Share on other sites More sharing options...
bascule Posted February 13, 2006 Share Posted February 13, 2006 [math]f_j = \sum_{k=0}^{n-1} x_k e^{-{2\pi i \over n} jk }[/math] Link to comment Share on other sites More sharing options...
the tree Posted February 13, 2006 Share Posted February 13, 2006 [math]\frac{(U+C+I)(10-S)}{20}\times A\times \frac{1}{1-\sin{\frac{F}{10}}}[/math] Any guesses as to what it is? Link to comment Share on other sites More sharing options...
bascule Posted February 13, 2006 Share Posted February 13, 2006 I like this one too... beauty in simplicity [math]\phi = {\sqrt{5}+1 \over 2}[/math] Link to comment Share on other sites More sharing options...
the tree Posted February 13, 2006 Share Posted February 13, 2006 This equation has the answer to GRAVITY and Cold FusionSound's fun, do we get to see it? Link to comment Share on other sites More sharing options...
ydoaPs Posted February 13, 2006 Share Posted February 13, 2006 This equation has the answer to GRAVITY and Cold Fusion theorein i don't see it Link to comment Share on other sites More sharing options...
ydoaPs Posted February 13, 2006 Share Posted February 13, 2006 [math]ln(2)=\sum^{\infty}_{k=1}{\frac{(-1)^{k+1}}{k}}[/math] mercator series when x=1.....lovely expression for ln(2) Link to comment Share on other sites More sharing options...
RyanJ Posted February 14, 2006 Share Posted February 14, 2006 [math]e^{i\pi} + 1 = 0[/math] wins out for me every time! Simply because it lists so many importannt and intresting things in it [math]E=mc^2[/math] Comes in a close second and any of the others could be third depending on my mood Cheers, Ryan Jones Link to comment Share on other sites More sharing options...
uncool Posted February 18, 2006 Share Posted February 18, 2006 Typo: Integration by parts is: integral(u dv) = uv - integral(v du) Personally, I like translation of coordinates with Jacobian... doubleintegral(F(x,y)dy dx) = doubleintegral(F(x(a,b),y(a,b))J((x,y),(a,b))db da) =Uncool= Link to comment Share on other sites More sharing options...
cosine Posted February 19, 2006 Share Posted February 19, 2006 Mine is [math]a + b = b + a[/math] Too often we take commutativity for granted! Link to comment Share on other sites More sharing options...
the tree Posted February 19, 2006 Share Posted February 19, 2006 Uncool, use LaTeX, it's so much more attractive. [math]\int u\cdot dv = uv - \int v \cdot du[/math] [math]\iint f(x,y)\cdot dy\cdot dx = \iint f\Big(x(a,b),y(a,b)\Big)j\Big((x,y),(a,b)\Big)\cdot db \cdot da[/math] Link to comment Share on other sites More sharing options...
Royston Posted February 20, 2006 Share Posted February 20, 2006 Well so far for me it's [math]E=mc^2[/math] simple, elegant and holds far reaching implications. Link to comment Share on other sites More sharing options...
herpguy Posted February 20, 2006 Share Posted February 20, 2006 Mine is a=lw because it helped me get through many years of elementary school. Link to comment Share on other sites More sharing options...
deltanova Posted February 23, 2006 Share Posted February 23, 2006 v=fw (lol here w= wavelength, dont know how to use latex and cant find the symbol thingie for wavelength.) why? because this is the very first formula i learnt in my physics class! (about 3 weeks ago) Link to comment Share on other sites More sharing options...
the tree Posted February 23, 2006 Share Posted February 23, 2006 dont know how to use latex and cant find the symbol thingie for wavelengthYou mean lambda? That'd be λ. In LaTeX it'd be: [math]v=f\lambda[/math]. (Click on any LaTeX image for teh code). Link to comment Share on other sites More sharing options...
deltanova Posted February 24, 2006 Share Posted February 24, 2006 Thanks heaps XD Link to comment Share on other sites More sharing options...
Norman Albers Posted February 26, 2006 Share Posted February 26, 2006 I describe necessary vacuum currents to solve for what's implied when you say 'Gaussian wave packet'. This should be the RHS of the Maxwell current eq: j = (-lambda^2 + rho/U) A . THUS IS THE VACUUM NOT A VACUUM Link to comment Share on other sites More sharing options...
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