All questions on Maths

Provide a counter example to prove why the following is not a vector space.

A= ((x,y) within R2 / x>=0)

I'm not sure why this is not a vector space. If I remember correctly, a vector space is commutative and associative?


For a vector space if x within R^2 then its additive inverse has to be. What is the additive inverse of (1,1) lets say?
14 January 2013
Add an answer