Jump to content
  • entries
    169
  • comments
    54
  • views
    131528

GDC Vault and Relations

Sign in to follow this  
VBStrider

575 views

Apparently you can get a lot of the GDC presentations for free at the GDC Vault website. It doesn't have everything unfortunately (I couldn't find Erin Catto's 2006 presentation), but there are some cool things in there. I didn't have much time to browse around, but the Halo: Reach networking presentation caught my eye; it's rather good, and I recommend it to anyone who is writing networking code.

Today I learned about relations and Cartesian products. The Cartesian product of two sets A and B is the set consisting of all the ordered pairs (a, b) where a is an element of A and b is an element of B.

A relation of a set V is any subset of the Cartesian product of V with itself. Given an ordered pair (a, b) of a relation R, a is said to related to b by R.

Relations can have several properties: reflexive, irreflexive, symmetric, asymmetric, and transitive. A relation R on V is reflexive if for every x in V there is an element (x, x) in R; it is irreflexive if for every x in V there is no element (x, x) in R. A relation R is symmetric if for every element (a, b), there is another element (b, a); it is asymmetric if for every element (a, b) where b is not a, there is no element (b, a). And finally, a relation R is transitive if for every element (a, b) there is an element (b, c) and (a, c).

I also learned that the cardinality of a set is the number of elements in that set.

Reposted from http://invisiblegdev.blogspot.com/
Sign in to follow this  


0 Comments


Recommended Comments

There are no comments to display.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!