/sci/ - Science & Math

A lightning strike just is you seeing the ionization casecade of electrons in air - you see a plasma.
What exacly do you mean with the effect, and does it matter that it's seen "inside"?
Both can be understood as Townsend breakdown, although I think in lage lighting strikes, you also need streamer theory.

>>4961110
Thanks mate!

Here's another interesting fact, dedicated to you:

If you have a set A, you can always build a strictly bigger set by taking the subsets of A, which is called P(A) (parts of A). For instance, if you have three objects A={a,b,c}, then P(A) would have the following elements:
∅, {a}, {b}, {c}, {a,b}, {a,c}, {b,c}, {a,b,c}
As you can see, there's a total of eight, which is <span class="math">2^3[/spoiler] It's easy to see that adding a fourth element d to A would duplicate the elements of P(A), because you'd have the preceding elements plus the ones which also have d. It follows that if A has cardinality <span class="math">n[/spoiler], then P(A) has cardinality <span class="math">2^n[/spoiler]. Of course, you can take the set of subsets of subsets P(P(A)) and nothing stops you from doing this again and again...

But one puzzling question arises when you consider infinite sets!

(to be continued in another post)

Can you argue what the relation between the speeds of a light wave vs. a gravitational waves on a wildly curved spacetime is?

What would you take as the characterisic property of the covariant derivative?

I advise you to read this

http://plato.stanford.edu/entries/scientific-realism/x
(the whole thing)

and maybe
http://plato.stanford.edu/entries/scientific-progress/

and ask again.