Affine independence refers to a set of points in a vector space that are not collinear, meaning they do not lie on the same straight line. In other words, the points are not linearly dependent, and there is no way to express one of the points as a linear combination of the others. Affine independence is important in various mathematical and geometric contexts, such as in linear algebra, optimization, and computer graphics. **

Affine subspaces are sets of points in a vector space that are closed under affine combinations. An affine combination of points is a weighted sum of the points where the weights sum to 1. Affine subspaces can be thought of as generalizations of lines, planes, and hyperplanes in higher dimensions. They can be represented as translations of linear subspaces, and they are characterized by the property that any two points in the subspace determine a unique line contained in the subspace. **

An affine subject refers to a person who is emotionally invested in a particular topic or issue. This emotional investment can lead the person to have a biased or subjective perspective on the matter. Affine subjects may have personal experiences, beliefs, or values that strongly influence their views and opinions on the topic, making it difficult for them to remain completely objective. It is important to recognize and consider the influence of affine subjects when evaluating their perspectives on a given subject. **

The main theorem of affine geometry states that given a set of points and a set of vectors in a vector space, there exists a unique affine space such that the points correspond to the origin of the space and the vectors correspond to the translations of the space. This theorem forms the foundation of affine geometry, which studies the properties of affine spaces and their transformations without considering the concept of distance or angles. It provides a framework for understanding the geometric properties of objects that remain unchanged under translation, rotation, and scaling. **

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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. **

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In geometry, a similarity transformation preserves the shape of a figure while changing its size. This transformation involves scaling, rotating, and reflecting the figure. On the other hand, an affine transformation includes not only scaling, rotating, and reflecting, but also translations. Affine transformations preserve parallel lines and ratios of distances between points, but they do not necessarily preserve angles or shapes. **