Question

let U={(x,y,z,w)Element R^4|x+z+w}
find a basis of u and dimension of u

Answer 1

question is a bit unclear , did i copy correctly

$$
\Large{ U= \left\{ (x,y,z,w) \in R^4|x+z+w| \right\}

}
$$

Answer 2

yes thats right

Answer 3

there is =0 after w i forgot to put that