/sci/ - Science & Math

Quick question /sci/.

What does this notation signify R / { -1 } --> R
when we are talking in terms of sets ( and functions and stuff )
Thanks.

Does light have a mass?
What is the mass of light?

The universe is beige.
http://www.youtube.com/watch?v=Zoz__pRZmGU

It's trivia time, my dears.

>>2389375
i like like you

5/???

ITT: Your favourite complex theory to explain to someone, knowing fine well it will confuse them, thus making you feel like an intellectual badass.

Not really science, but neat.

OK, so I have a question about infinity.

Lets say you knew you were at a point in an infinite sequence, with a beginning, but no end. For example, say you knew there had been an original Big Bang, then an endless cycle of big bangs and big crunches, all with people in them. But you don't know what number universe you are in.

Now, presumably you would assume your number to be pretty big. but here is the question - would the number of your position in the sequence be infinite or finite?

For any finite number n the ratio of numbers bigger than n to those smaller is infinity to one, so your number will always be bigger than any finite number.

This suggests that our number will be infinite, but are infinite numbers even possible?

I suppose you could also say that the situation is not possible, but this would rule out a lot of theories about the universe, eg the one above

What are some good science or math books available on the nook?

Fucking magnets how do they work?

Let's just share some science related pictures.
(Found this on /r9k/ btw, if anyone knows the original source, feel free to inform me about it.)

Mr. Young, are you here?

Where the fuck is Uranus?

>>1004612
I only have this kinda lo-res version.