Have you uninstalled any programs lately? If so, try reinstalling them. The uninstallation may remove some important files causing the blue screen.
It may be nice to backup your important files anyway. An affordable portable hdd or a link cable to a desktop pc with a large hdd does the job...
If you can use TeX or LateX to type your document, you may use the TeXForm[result] command in Mathematica to see the "result" in TeX form, then you can copy-paste it. By the way, there was a program (not free) which translates LaTeX files into Word files but I do not remember the name.
Everything has seemed allright because I have changed the eta in my metric file for the Euclidean sign and it gave the Weyl scalars and spin coeff.s right. The Ricci scalars' computation was the problem.
Yes, the mystery is solved. I have already checked my tetrad and it gives the metric right. I have changed the signature by hand and I did not use the nptetrad command (it really changes the signature which is not valid for my Euclidean case). I think my tetrad is not the right choice for...
Yes, I am referring to the great GRTensorII. I checked the tetrad from two articles and it satisfies the relations needed (I also checked by hand). I was thinking the Ricci scalar might be a combination of some NP Ricci scalars after having nonzero values. By the way, the both answers satisfy...
I calculate trace-free Ricci scalars (Phi00, Phi01,Phi02, etc) and scalar of curvature (Lambda=R/24) in Newman-Penrose formalism using a computer package. How can I find the Ricci scalar out of them? I though R was the Ricci scalar but Lambda comes non-zero for a spacetime whose Ricci scalar is...
I recommend Maple for a mathematician but before buying a software consult to your department's system administrator. Some universities have a campus license for some programs. Learning Maple may be harder than some other but it worths. I also recommend you to learn a programming language like...
Mathematica is the easiest with its palettes as an "advanced calculator". But if you want to expertise in mathematical or theoretical physics Maple worths studying. If you will be dealing with large matrices or more "engineering" stuff, Matlab must be your choice. In my opinion, Mathematica is...
Important thing is what will you do with that knowledge? If you are going to use it for solving physics problems, you should know one symbolic program (matlab,maple or mathematica) and for the things you cannot do with them or when you want to have everything in your hands, one programming...
I googled your question as "flow chart drawing" and found that program:
http://www.breezetree.com/flowcharting-software/
You may of course find others.
You can plot real and imaginary parts separately:
Plot[Re[eq],{parameter,initial,final}]
Plot[Im[eq],{parameter,initial,final}]
Or you can go for 3D plots.
Instead of searching the file in your hard drive, try to capture its internet link and download with a downloader (flashget, etc.). To do this, use right click on the button which you pressed to watch the video, or view the source code (html code) of the page and if you recognize your file's...
I have Christoffel symbols for a metric and I want to find the connection 1-forms.
I have the relation:
w(^i j)=Chr(^i j k)*dx(^k)
w: conn. 1-form
Chr: Christoffel symbols
But Christoffel symbols do not share the symmetries of the conn. 1-forms. Do you know any way to make this...
If you have Maple and GRTensor package you can calculate christoffel symbols for many metric files coming with the grtensor package and work them out yourself to exercise.