1. The problem statement, all variables and given/known data If we have a matrix in R^(2x3), what dimension does this matrix have? My book doesn't answer this question - it only tells me what the dimensions are of the different spaces, not of the matrix as a whole. 3. The attempt at a solution I would think the dimension is the number of columns, but it's just a guess. I hope you guys can clarify this for me.