Let WWW be the subspace of R4\mathbb{R}^4R4 defined by x1+x2+x3+x4=0x_1+x_2+x_3+x_4 = 0x1+x2+x3+x4=0 and x1−x2+x3−x4=0x_1-x_2+x_3-x_4 = 0x1−x2+x3−x4=0. What is the dimension of WWW?
1
2
3
0