No typo there. When we talk about vectors we mean "column vector". As it's easier to read horizontally (and takes less place in a paper), most of the time we wr

No typo there. When we talk about vectors we mean "column vector". As it's easier to read horizontally (and takes less place in a paper), most of the time we write x^T = {a, b, c} rather than writing them in a column shape.