2. Let W be the union of the first and third quadrants in the xy- plane. That is, let W = xy 0 a. If u is in W and c is any scalar, is cu in W? Why?

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Number 2 part a and b and number 4 from 4.1 vector space
196
CHAPTER 4
Vector Spaces
b. Find specific vectors u and v in W such that u + v is
not in W. This is enough to show that W is not a vector
In Exercises 15-18, let W be the set of all
shown, where a, b, and c represent arbitrary
each case, either find a set S of vectors that spa
example to show that W is not a vector space.
space.
3. Let H be the set of points inside and on the unit circle in
the xy-plane. That is, let H =
:x + y < 1.
2a + 3b
Find
15.
-1
16.
3a -5b
a specific example-two vectors or a vector and a scalar-to
show that H is not a subspace of R².
2a - 5b
36+2a
2a-b
3b - c
4a+3E
4. Construct a geometric figure that illustrates why a line in R?
not through the origin is not closed under vector addition.
17.
01
3c - a
18.
a+36 +
36-2с
19. If a mass m is placed at the end of a spring, an
pulled downward and released, the mass-spri
begin to oscillate. The displacement y of the
resting position is given by a function of the fa
In Exercises 5-8, determine if the given set is a subspace of P, for
an appropriate value of n. Justify your answers.
3b
5. All polynomials of the form p(t) = at?, where a is in R.
6. All polynomials of the form p(t) = a + 1², where a is in R.
7. All polynomials of degree at most 3, with integers as coeffi-
y(t) = c1 cos wt + c2 sin wt
cients.
where w is a constant that depends on the spring
(See the figure below.) Show that the set of
described in (5) (with w fixed and c,Cz arbitran
8. All polynomials in P, such that p(0) = 0.
-2t
space.
9. Let H be the set of all vectors of the form
5t
Find a
3t
vector v in R3 such that H = Span {v}. Why does this show
that H is a subspace of R3?
3t
10. Let H be the set of all vectors of the form
where t
-7t
is any real number. Show that H is a subspace of R. (Use
the method of Exercise 9.)
[2b + 3c
11. Let W be the set of all vectors of the form
--b
2c
20. The set of all continuous real-valued functions
closed interval [a,b] in R is denoted by Cla, b!
a subspace of the vector space of all real-value
defined on [a, b].
a. What facts about continuous functions shou
in order to demonstrate that C[a, b] is indee
as claimed? (These facts are usually dis
calculus class.)
where b and c are arbitrary. Find vectors u and v such that
W = Span {u, v}. Why does this show that W is a subspace
of R3?
2s+4t
2.s
12. Let W be the set of all vectors of the form
2s - 31
5t
Show that W is a subspace of R. (Use the method of
Exercise 11.)
b. Show that {f in Cla, b]: f(a) = f(b)} is a
Cla, b).
4
For fixed positive integers m and n, the set Mxe
matrices is a vector space, under the usual operation
of matrices and multiplication by real scalars.
13. Let vị =
0 , V2 =
2
and w =
1
V3 =
3
6.
a. Is w in {v, V2, V3}? How many vectors are in {v1, V2, V3}?
wwww
Transcribed Image Text:196 CHAPTER 4 Vector Spaces b. Find specific vectors u and v in W such that u + v is not in W. This is enough to show that W is not a vector In Exercises 15-18, let W be the set of all shown, where a, b, and c represent arbitrary each case, either find a set S of vectors that spa example to show that W is not a vector space. space. 3. Let H be the set of points inside and on the unit circle in the xy-plane. That is, let H = :x + y < 1. 2a + 3b Find 15. -1 16. 3a -5b a specific example-two vectors or a vector and a scalar-to show that H is not a subspace of R². 2a - 5b 36+2a 2a-b 3b - c 4a+3E 4. Construct a geometric figure that illustrates why a line in R? not through the origin is not closed under vector addition. 17. 01 3c - a 18. a+36 + 36-2с 19. If a mass m is placed at the end of a spring, an pulled downward and released, the mass-spri begin to oscillate. The displacement y of the resting position is given by a function of the fa In Exercises 5-8, determine if the given set is a subspace of P, for an appropriate value of n. Justify your answers. 3b 5. All polynomials of the form p(t) = at?, where a is in R. 6. All polynomials of the form p(t) = a + 1², where a is in R. 7. All polynomials of degree at most 3, with integers as coeffi- y(t) = c1 cos wt + c2 sin wt cients. where w is a constant that depends on the spring (See the figure below.) Show that the set of described in (5) (with w fixed and c,Cz arbitran 8. All polynomials in P, such that p(0) = 0. -2t space. 9. Let H be the set of all vectors of the form 5t Find a 3t vector v in R3 such that H = Span {v}. Why does this show that H is a subspace of R3? 3t 10. Let H be the set of all vectors of the form where t -7t is any real number. Show that H is a subspace of R. (Use the method of Exercise 9.) [2b + 3c 11. Let W be the set of all vectors of the form --b 2c 20. The set of all continuous real-valued functions closed interval [a,b] in R is denoted by Cla, b! a subspace of the vector space of all real-value defined on [a, b]. a. What facts about continuous functions shou in order to demonstrate that C[a, b] is indee as claimed? (These facts are usually dis calculus class.) where b and c are arbitrary. Find vectors u and v such that W = Span {u, v}. Why does this show that W is a subspace of R3? 2s+4t 2.s 12. Let W be the set of all vectors of the form 2s - 31 5t Show that W is a subspace of R. (Use the method of Exercise 11.) b. Show that {f in Cla, b]: f(a) = f(b)} is a Cla, b). 4 For fixed positive integers m and n, the set Mxe matrices is a vector space, under the usual operation of matrices and multiplication by real scalars. 13. Let vị = 0 , V2 = 2 and w = 1 V3 = 3 6. a. Is w in {v, V2, V3}? How many vectors are in {v1, V2, V3}? wwww
Is, and they will receive more attention later.
AS
of all points in R? of the form (3s,2+5s) is not a vector space,
not closed under scalar multiplication. (Find a specific vector
such that cu is not in H.)
..,vp}, where V1,... , Vp are in a vector space V. Show that Vk
p. [Hint: First write an equation that shows that vi is in W.
cation for the general case.]
that cu is not in V. (This is enough to show that V is not
a vector space.)
2. Let W be the union of the first and third quadrants in the
xy-
plane. That is, let W =
: ху >
uch
If u is in W and c is any scalar, is cu in W? Why?
a.
Transcribed Image Text:Is, and they will receive more attention later. AS of all points in R? of the form (3s,2+5s) is not a vector space, not closed under scalar multiplication. (Find a specific vector such that cu is not in H.) ..,vp}, where V1,... , Vp are in a vector space V. Show that Vk p. [Hint: First write an equation that shows that vi is in W. cation for the general case.] that cu is not in V. (This is enough to show that V is not a vector space.) 2. Let W be the union of the first and third quadrants in the xy- plane. That is, let W = : ху > uch If u is in W and c is any scalar, is cu in W? Why? a.
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