Recent content by catscradle

The key for the standard basis is R^2. It's different for all R^n, so focus on the two

I need some help with examples. Especially number 2. 1) Name a subset which is closed under vector addition and additive inverses but is not a subspace of R squared. I think I got this one. {(x,y) st x,y are elements of integers} because this isn't closed under scalar multiplication...