Let ?1 ⃗ , ?2 ⃗ , ?3 ⃗ be three vectors from ℝ3 such no...
Let ?1 ⃗ , ?2 ⃗ , ?3 ⃗ be three vectors from ℝ3 such no two
vectors are parallel, and ?3 ⃗ is not in the plane spanned by ?1 ⃗
and ?2 ⃗ . Prove that {?1 ⃗ , ?2 ⃗ , ?3 ⃗ } forms a basis for
ℝ3
Let S be the set of vectors in R4
S ={(1,1,-1,2),(1,0,1,3),(1,-3,2,2),(0,-2-1,-2)}
(a) State whether the vectors in the set are linearly
independent.
(b) Find the basis for S.
(c) Find the dimension of the column space (rank S).
(d) Find the dimension of the null space (nullity S).
(e) Find the basis for the null space of S?
Given the vectors u1 = (2, −1, 3) and u2 = (1, 2, 2) find a
third vector u3 in R3 such that
(a) {u1, u2, u3} spans R3
(b) {u1, u2, u3} does not span R3
Let ?1=(1,0,1,0) ?2=(0,−1,1,−1) ?3=(1,1,1,1) be linearly
independent vectors in ℝ4.
a. Apply the Gram-Schmidt algorithm to orthonormalise the vectors
{?1,?2,?3} of vectors {?1,?2,?3}.
b. Find a vector ?4 such that {?1,?2,?3,?4} is an orthonormal basis
for ℝ4 (where ℝ4 is the Euclidean space, that is, the
inner product is the dot product).
1) Determine the angle between vectors:
U = <2, -3, 4> and V= <-1, 3, -2>
2) determine the distance between line and point
P: -2x+3y-4z =2
L: 3x – 5y+z =1
3) Determine the distance between the line L and the point A
given by
L; (x-1)/2 = (y+2)/5 = (z-3)/4 and A (1, -1,1)
4) Find an equation of the line given by the points A, B and
C.
A (2, -1,0), B (-2,4,-1) and C ( 3,-4,1)...
Let (R 3 , ×) be the set of 3d vectors equipped with the
operation of vector crossproduct. Which of the following properties
does this operation satisfy (give proofs in all cases)?
(a) has identity element(s)? (If so, determine all identity
elements.)
(b) has idempotent element(s)? (If so, determine all idempotent
elements.)
(c) commutative?
(d) associative?
Are the vectors v1 = (1 , 2, 3), v2 = (2, 4, 6), and v3 = (1, 1,
3) linearly independent or dependent? Since v2 is a scalar multiple
of v1, both v1 and v2 are linearly dependent, but what does that
say about the linear dependence of the three vectors as a
whole?
2) Let v, w, and x be vectors in Rn.
a) If v is the zero vector, what geometric object represents all
linear
combinations of v?
b) Same question as a), except now for a nonzero v.
c) Same question as a) except now for nonzero vectors v and w (be
care-
ful!).
d) Same question as a) except now for nonzero vectors v, w, and x
(be
extra careful!).
Let ?1, ?2, ?3 be 3 independent random variables with uniform
distribution on [0, 1]. Let ?? be the ?-th smallest among {?1, ?2,
?3}. Find the variance of ?2, and the covariance between the median
?2 and the sample mean ? = 1 3 (?1 + ?2 + ?3).