1) An orthogonal basis:
x1=v1=(1,1,1,1)
x2=v2−x1⋅x1v2⋅x1x1=(1,1,2,4)−48(1,1,1,1)=(−1,−1,0,2)
x3=v3−x1⋅x1v3⋅x1x1−x2⋅x2v3⋅x2x2
x3=(1,2,−4,−3)+44(1,1,1,1)−6−1−2−6(−1,−1,0,2)=(0.5,1.5,−3,1)
2) An orthonormal basis:
w1=∣∣x1∣∣x1=21(1,1,1,1)
w2=∣∣x2∣∣x2=61(−1,−1,0,2)
w3=∣∣x3∣∣x3=12.51(0.5,1.5,−3,1)=52(0.5,1.5,−3,1)
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