Hi!
This is a suggestion of a new thread to talk about. The subject
is the fact that real phenomena are, practically always, extremely
complicated and not quite suitable for exact study. It is by
disregarding a lot of details (correctly chosen by a good intuition)
that a productive analysis is possible.
As an introduction to this state of affairs I will pose a (funny)
Challenge: I will perform a sinple tast{ and challenge that none of
you will be able to repeat it. The task is the following:
I will take a piece of paper (say, a page of newspaper) and throw
it, standing straight up, into the air. The paper will fall to the
floor at some place and in some position, which we should determine
precisely (taking, for example, a photo). I challenge that nobody can
throw the paper so as to fall again on the same place and in the same
position, exactly. Emilio