I have a vague recolection from Pre-Calculus of learning about unit vectors...

 

Vector "i" and "j"... one of which goes from (0,0) to (0,1), the other (0,0) to (1,0). Does any this ring a bell to anyone? and if so, can you tell me which one is which? I can't seem to find it.

 

I think "i" is (0,0) -> (0,1), and "j" is (0,0) -> (1,0).

 

And, is there one of these for the thrid dimention? (eg, from (0,0,0) -> (0,0,1))

Wrong way around

 

[imath]\vec{i} = (1,0,0), \vec{j} = (0,1,0), \vec{k} = (0,0,1)[/imath].

 

k is the symbol denoted for the z-axis unit vector.

thanks dave! it makes sence, x,y,z (i,j,k)...

No problem.