Exercises 3.1 A. Let W = {(s, 3s, -s) : sreal}. Show that W is a subspace of R3. 2. Let U = {(s, -2s,
Exercises 3.1 A. Let W = {(s, 3s, -s) : sreal}. Show that W is a subspace of R3. 2. Let U = {(s, -2s, s + 1) : s real}. Show that U is not a subspace of R3
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