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Affine may refer to:
- Affine cipher, a special case of the more general substitution cipher
- Affine combination, a certain kind of constrained linear combination
- Affine connection, a connection on the tangent bundle of a differentiable manifold
- Affine differential geometry, a geometry that studies differential invariants under the action of the special affine group
- Affine geometry, a geometry characterized by parallel lines
- Affine group, the group of all invertible affine transformations from any affine space over a field K into itself
- Affine logic, a substructural logic whose proof theory rejects the structural rule of contraction
- Affine representation, a continuous group homomorphism whose values are automorphisms of an affine space
- Affine scheme, the spectrum of prime ideals of a commutative ring
- Affine space, an abstract structure that generalises the affine-geometric properties of Euclidean space
- Affine transformation, a transformation that preserves the relation of parallelism between lines
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