...compute

This computation are a bit tricky but not hard. [3]

...cover

this idea is a very powerful one and was used after in several proof that cannot be done before. Like prove that the horizon of a black hole is a sphere.

...spacetime

We have the problem of the creation of a trapped surface, but it is not the point here. We are interested in the possibility of seeing the trapped surface not in its creation.

...closed

In fact 242#242 is closed by definition, page .

Peggy Varniere
Fri Jul 24 11:57:38 EDT 1998