# R3, R4, Rn Vector Space

1. Feb 16, 2010

### tomfrank

1. The problem statement, all variables and given/known data

Calculate ||1,1,1||in R3
Calculate ||1,1,1,1|| in R4.
Calculate ||1,1,....,1|| in Rn.

2. Relevant equations
All I have in this problem is that, Where do I start?

3. The attempt at a solution

2. Feb 16, 2010

### LCKurtz

What does ||1,1,1|| mean? This isn't a leading question; I want to know what that symbol is supposed to represent.

3. Feb 16, 2010

### kaitamasaki

I'm guessing || means the magnitude, or the scalar length of the vector.

[Moderator's note: solution deleted]

Last edited by a moderator: Feb 16, 2010
4. Feb 16, 2010

### LCKurtz

I would guess that too, but I'm trying to get the poster to write it correctly for starters. You wouldn't normally write a vector as 1,1,1.

Last edited: Feb 17, 2010
5. Feb 16, 2010

### tomfrank

it means the magnitude, i believe.

6. Feb 17, 2010

### Staff: Mentor

So how do you calculate the magnitude of a vector in R3, R4, Rn?