The 'T' means transposed.
Consider the four non-zero COLUMN vectors in R^2:
x=[x1, x2]; y=[y1, y2]; w=[w1, w2]; z=[z1, z2]
Let xTw=0, yTz=0, A=xyT, B=wzT
Determine:
a) The 2-norm of A
b) The singular value decomposition (SVD) of A
c) The Range space and Nullspace of A
d) The pseudo-inverse de A
e) The singular value decomposition (SVD) of A+B