I tried to use Mathematica to solve this OED set: DSolve[{y''[r] + (1/r + 2 I p) y'[r] + (-2 h + 2/r - m^2/r^2 - p^2) y[r] == 2 a z[r], z''[r] + (1/r - 2 I p) z'[r] + (-2 h + 2/r - m^2/r^2 - p^2) z[r] == 2 a y[r]},{y,z}r] . But as I input it, nothing works. Mathematica just give back the same equations to me. Interestingly, either of the 2 equations can be solved separately, including the other in its expression. I mean: DSolve[y''[r] + (1/r + 2 I p) y'[r] + (-2 h + 2/r - m^2/r^2 - p^2) y[ r] == 2 a z[r], y[r], r] DSolve[z''[r] + (1/r - 2 I p) z'[r] + (-2 h + 2/r - m^2/r^2 - p^2) z[ r] == 2 a y[r], z[r], r] /. y[r] -> % . Would anybody please help me, or explain why this phenomenon occurs?

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5/19/2014 6:04:56 AM

Hi, all. This problem is annoying This: Solve[{yx13b == (-dg sxa yx13a + Sqrt[-dg dx1 sxa^2 yx13a + dg px013a sxa^2 yx13a - dg hxa sxa^2 yx13a^2 - dg sxa vx13a yx13a^2])/(dg sxa), yx13b == (-dx3 sxb + px013b sxb - 2 dg sxb yx13a - Sqrt[ 4 dg sxb (-dg sxb - hxb sxb - vx13b) yx13a^2 + (-dx3 sxb + px013b sxb - 2 dg sxb yx13a)^2])/( 2 (dg sxb + hxb sxb + vx13b))}, {yx13a, yx13b}] can't solve. Why? Perhaps you didn't wait long enough... I didn't have the time or patience either. But, let's have a closer look. There are two equations f...

Can't do math. Can't read. We must be talking about Snit. LOL! ...

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A few evenings ago I was speaking with a "learned mathematician" at the local university here. In the course of our wide-ranging talk, he stated that Mathematica is only capable of doing less than half the problems in mathematics today. I was floored at his assertion. I have only scratched the surface of all that Mathematica can do. There's tons more that it CAN'T do??? Your comments are welcome. Nicholas Kormanik A couple of comments. First, if I could do "only" half the problems in mathematics, which is probably an infinite number, I woul...

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Hi all, I have an axes and an image in the axes. I am trying to set the axes "Position" property to align the axes (and, thus, the image) in the figure the way I want. But every time I set the Position property I just get a white bground instead of the image and no axes. my_axes = axes; set(gca,'Position',[50 50 500 500]); image('cdata',cdata,'cdatamapping','scaled'); If I leave the "set" line out, the image gets displayed (but with a default position which I don't like). I tried playing with units, etc, no luck. Does anyone have an i...

Dear LN Experts, I have a simple Lotus Notes database containing a form with several fields but no subforms. In production, the application does not allow anyone to print documents created with the main form or to forward them via email. I have checked each field individually and confirmed that the form security setting allows printing and forwarding and I am at a loss to resolve the problem. Although I am a manager in the db, I myself am not allowed to print a document. The print option is grey in the file menu. If I create a new document, enter some data and save it,...

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Hi All, I need to solve below two equations using mathematica. x and y are variables all other parameters are constants. Below are the two equations I need to solve and find x and y in terms of other constants. (a1*Sin[x-b1] / (y^2+a2*y+a3*y*Cos[x-b1]+c1)^0.5) + (a4*Sin[x-b2] / (y^2+a5*y+a6*y*Cos[x-b2]+c2 )^0.5 )==0 ( 2*y+a2+a3*Cos[x-b1] / (y^2+a2*y+a3*y*Cos[x-b1]+c1) ^0.5 ) + (2*y + a5 + a6 * Cos[x-b1] / (y^2 + a5*y + a6 * y *Cos[x-b2] + c2)^0.5 ) == -2/ (1+a7*r^(y/a8)) Use Kernel->Interrupt/Abort Evaluation from menu of front-end so PC is not stuck. ...

Dear all, I have two coupled ordinary differential equations which satisfied by two functions, a(t) and az(t). It can be shown analitically that as t approaches infinity, a(t) approaches az(t). But the numerical solution given by Mathematica doesn't agree this. Here is my code: ----------------------- lam = 1; eqb = ((a'[t]/a[t])^2 + 2a'[t]*az'[t]/a[t]/az[t] == lam); eqaz = (3(a'[t]/a[t])^2 + 2(a''[t]/a[t] - (a'[t]/a[t])^2) == lam); sol = NDSolve[{eqb, eqaz, a[0] == 1, az[0] == .5, a'[0] == .6}, {a[t], az[t]}, {t, 0, 2000}, MaxSteps -> 200...

More precisely, why does sys.ps1 not appear if I set it to a unicode string? This problem is hard for me to describe here because my newsreader is not properly unicode enabled, but here's the gist of it: Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> First, let's make sure our encodings are set properly: >>> import sys >>> sys.stdin.encoding 'utf-8' >>> sys.std...

Hi All, I need to solve below equation. My PC got stuck. Solve[{(\[Mu]0 Sin[t - t0])/Sqrt[ l2^2 + \[Mu]0 l2 Cos[t - t0] + \[Lambda]0] + (\[Mu]1 Sin[t - t1])/ Sqrt[l2^2 + \[Mu]1 l2 Cos[t - t1] + \[Lambda]1] == 0, (2 l2 + \[Beta]0 + \[Mu]0 Cos[t - t0])/Sqrt[ l2^2 + \[Mu]0 l2 Cos[t - t0] + \[Lambda]0] + ( 2 l2 + \[Beta]1 + \[Mu]1 Cos[t - t1])/Sqrt[ l2^2 + \[Mu]1 l2 Cos[t - t1] + \[Lambda]1] + 2/( 1 + V r^(l2/D0)) == 0}, {t, l2}] ...