Can math.atan2 return INF?
Gregory Ewing <greg.ewing at canterbury.ac.nz>:
> Marko Rauhamaa wrote:
>> We cannot get any information on black holes proper because black holes
>> cannot come into existence according to the very theory that predicts
>> black holes. It will take infinitely long for an event horizon to form.
> Only in some frames of reference.
> By your reasoning, Zeno's paradox proves that a runner can never reach
> the finish line in a race.
In Zeno's case, the limit is finite. Zeno's error is not realizing that
you can pack an infinite number of jiffies in finite time. In the black
hole case, the limit is infinite.
> But it really only proves that if you measure time in such a way that
> the finishing time is infinitely far in your future, you will never
> see him finish.
An external observer never experiences any effect whatsoever (direct or
indirect) from an event horizon or a black hole.
> But there's no reason you have to draw the coordinates that way; there
> are plenty of others in which the time axis does cross the horizon.
Not where I'm standing.