||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
 christoffel(3,3,2, [t,r,theta,phi], m)
-sin(theta)*cos(theta)
 X = christoffel(1,1,1,[t,r,theta,phi],m)
 X
 1/2/((1/r - 1)*r^2)
 X.rational_simplify()
 -1/2/(r^2 - r)

}}}

/* code_ends */

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