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The Maxima on-line user's manual

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Einstein

Function: einstein (<dis>) A function in the ctensor (component tensor) package. einstein computes the mixed Einstein tensor after the Christoffel symbols and Ricci tensor have been obtained (with the functions christof and ricci). If the argument <dis> is true, then the non-zero values of the mixed Einstein tensor ein[i,j] will be displayed where j is the contravariant index. The variable rateinstein will cause the rational simplification on these components. If ratfac is true then the components will also be factored.

/*  Schwarzschild simplesave as name.macLoad from the file menu - > File|Batch file*/kill(all);
load(ctensor);
/* set some flags */cframe_flag: false;
ratchristof: true;
ratriemann : true;
ratfac : true;
ctrgsimp: true;
/* define the dimension */dim: 2;
/* list the coordinates */ct_coords: [theta,phi];
/* set up the metric *//* assign to lg a matrix of zeros

There are also some inexact matches for einstein. Try ?? einstein to see them.

(%o1)                                true
(%i2) 

Related Examples

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-sin-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-sin-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-scurvature-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-ident-load-true

load(ctensor);

ct_coords:[t,x,y,z];

lg:ident(4);

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-scurvature-sin-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-scurvature-sin-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-scurvature-sin-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-false-invert-kill-load-ratfac-ratriemann-rinvariant-scurvature-true

/* Schwarzschild sim...

load(ctensor);

/* set some flags */c...

Calculate

einstein-ident-load-sin-true

load(ctensor);

ct_coords:[t,r,q,p];

lg:ident(4);

Calculate