Suppose V is a vector space with scalar fleld R. Thomas and Valentina want to prove that some set S C V is a subspace of V. Thomas decides to play it safe and use the Subspace Theorem, as stated in the notes, and check that the following three statements are true: (A) S contains the zero vector 0. (B) S is closed under vector addition. (C) Sis closed under scalar multiplication. But Valentina wants change condition (A) to something that they think is simpler. Valentina also thinks that (C) is unnecessary. As a result, Valentina proposes using just the following two conditions to prove that S is a subspace of V: (1) S {}. (2) If u, v € S then u + v € S. (a) Is it correct to claim that statement (A) can be replaced with statement (1) if (B) and (C) are kept? Select the option you believe to be true and then prove your assertion in the box tolow. O Yes, (A) can be replaced with (1). No, (A) cannot be replaced with (1). (The question continues below this essay box, make sure you scroll to the end of this question.)

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Suppose V is a vector space with scalar field R.
Thomas and Valentina want to prove that some set SCV is a subspace of V.
Thomas decides to play it safe and use the Subspace Theorem, as stated in the notes, and check that the following
three statements are true;
(A) S contains the zero vector 0.
(B) S is closed under vector addition.
(C) S is closed under scalar multiplication.
But Valentina wants change condition (A) to something that they think is simpler. Valentina also thinks that (C) is
unnecessary. As a result, Valentina proposes using just the following two conditions to prove that S is a subspace of
V:
(1) S±{}
(2) If u, v E S then u +v€ S.
(a) Is it correct to claim that statement (A) can be replaced with statement (1) if (B) and (C) are kept? Select the
option you believe to be true and then prove your assertion in the box tolow.
O Yes, (A) can be replaced with (1).
O No, (A) cannot be replaced with (1).
(The question continues below this essay box, make sure you scroll to the end of this question.)
Eeuation
Edtor
A A- T BIUS X, x
Transcribed Image Text:Suppose V is a vector space with scalar field R. Thomas and Valentina want to prove that some set SCV is a subspace of V. Thomas decides to play it safe and use the Subspace Theorem, as stated in the notes, and check that the following three statements are true; (A) S contains the zero vector 0. (B) S is closed under vector addition. (C) S is closed under scalar multiplication. But Valentina wants change condition (A) to something that they think is simpler. Valentina also thinks that (C) is unnecessary. As a result, Valentina proposes using just the following two conditions to prove that S is a subspace of V: (1) S±{} (2) If u, v E S then u +v€ S. (a) Is it correct to claim that statement (A) can be replaced with statement (1) if (B) and (C) are kept? Select the option you believe to be true and then prove your assertion in the box tolow. O Yes, (A) can be replaced with (1). O No, (A) cannot be replaced with (1). (The question continues below this essay box, make sure you scroll to the end of this question.) Eeuation Edtor A A- T BIUS X, x
(b) Valentina says that using (2), it's easy to show that if u is in S then 2u, 3u, 4u, ...are also all in S and sa S is
closed under scalar multuplication. The first part of Valentina's claim is equivalent to the following statement
(Z) If u E Sand n is a postive integer then nu E S.
In the box below, prove that (Z) follows from (2) but that this does not show that S is closed under scalar
multiplication.
Transcribed Image Text:(b) Valentina says that using (2), it's easy to show that if u is in S then 2u, 3u, 4u, ...are also all in S and sa S is closed under scalar multuplication. The first part of Valentina's claim is equivalent to the following statement (Z) If u E Sand n is a postive integer then nu E S. In the box below, prove that (Z) follows from (2) but that this does not show that S is closed under scalar multiplication.
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