An affine subspace is a subset of a vector space that is obtained by translating a subspace by a fixed vector. It is a flat geometric object that does not necessarily pass through the origin. On the other hand, a spanned subspace is a subspace that is formed by taking linear combinations of a set of vectors. It is the smallest subspace that contains all the vectors in the set. **

A subspace is a subset of a vector space that is itself a vector space. It must satisfy two conditions: it must contain the zero vector, and it must be closed under vector addition and scalar multiplication. In other words, a subspace is a smaller space within a larger vector space that retains the same structure and properties of the original space. Subspaces are important in linear algebra as they help in understanding the structure and properties of vector spaces. **

Base vectors are a set of linearly independent vectors that can be used to represent any vector in a given vector space through linear combinations. They form the basis for the vector space and are often denoted as e1, e2, e3, etc. Subspace vectors are vectors that belong to a subset of a larger vector space, and they can be expressed as linear combinations of the base vectors. Subspace vectors are used to define a smaller, more specific vector space within the larger space. **

No, the subspace generated by the vectors x1, x2, x3, x4, r3, x2, 2x1, x3, x4 is not a subspace. This is because the set of vectors is not closed under addition and scalar multiplication. For example, if we take x1 and 2x1 from the set and add them together, the result is not in the set. Therefore, the set does not satisfy the closure properties required to be a subspace. **

The notation for a subspace problem typically involves denoting the vector space in question, along with specifying the conditions that need to be satisfied for a subset to be considered a subspace. This notation often includes symbols such as V for the vector space, U for the subset being considered, and conditions such as closure under addition and scalar multiplication. The notation may also involve using set notation to represent the elements of the subset and the vector space. **

A small subspace refers to the dimension of the subspace, not the elements. The dimension of a subspace is the number of linearly independent vectors needed to span the subspace. So, a small subspace would have a low dimension, meaning it can be spanned by a small number of vectors. This is in contrast to a large subspace, which would have a high dimension and require a larger number of linearly independent vectors to span it. **

A is a subspace because it satisfies the three properties of a subspace: it contains the zero vector, it is closed under vector addition, and it is closed under scalar multiplication. On the other hand, B is not a subspace because it does not contain the zero vector. Therefore, it fails to satisfy the first property of a subspace. **

To prove that a subset of a vector space is a subspace, we need to show that it satisfies three properties: closure under addition, closure under scalar multiplication, and contains the zero vector. To prove closure under addition, we need to show that the sum of any two vectors in the subset is also in the subset. To prove closure under scalar multiplication, we need to show that multiplying any vector in the subset by a scalar results in a vector that is also in the subset. Finally, to prove that the subset contains the zero vector, we need to show that the zero vector is in the subset. If all three properties are satisfied, then the subset is a subspace of the vector space. **