Analytic and Numerical Relativity at "The Lens Grinding and

Center of Gravity"

We will use Maple 11 to do the algebra and FORTRAN to do the arithmetic, which will be outputted by Maple 11.   Regge Calculus "by a simplicial discretization of the metric space-time manifold and the gravitational action, originally due to Regge (1961). In Regge calculus, the metric tensor associated with each simplex is expressed as a function of the squared edge lengths, which are the dynamical variables of this model Regge geometry can be viewed as a special case of a continuum Riemannian manifold with a flat metric in the interior of its 4-simplices and singular curvature assignments to its two-simplices, known as the bones or hinges (Loll 1998)." from http://scienceworld.wolfram.com/physics/ReggeCalculus.html. 

How come Lens Grinding:  see URL http://en.wikipedia.org/wiki/Spinoza

"Benedictus de Spinoza or Baruch de Spinoza (Hebrew: ברוך שפינוזה) (lived November 24, 1632 – February 21, 1677) was a Dutch philosopher of Portuguese Jewish origin. Revealing considerable scientific aptitude, the breadth and importance of Spinoza's work was not fully realized until years after his death. Today, he is considered one of the great rationalists of 17th-century philosophy, laying the groundwork for the 18th century Enlightenment and modern biblical criticism. By virtue of his magnum opus the posthumous Ethics, he is also considered one of Western philosophy's definitive ethicists.

Spinoza lived a quiet life as a lens grinder, turning down rewards and honours throughout his life, including prestigious teaching positions, and gave his family inheritance to his sister. Spinoza's moral character and philosophical accomplishments prompted twentieth-century philosopher Gilles Deleuze to name him "The absolute philosopher" (Deleuze, 1990). Spinoza died in February 1677 of consumption, likely compounded by fine glass dust inhaled while tending to his trade. Variations to his surname are abundant: Despinoza, d'Espinoza, de Spinoza, Spinoza, et cetera." from the Wikipedia on May 7, 2007.

Montgomery College's Planetarium home page.

web page by Dr. Harold Williams, last modified 2:31P.M. June 27,  2008.