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  2. Cofibration - Wikipedia

    en.wikipedia.org/wiki/Cofibration

    That is, if : is any (continuous) map (between compactly generated spaces), and : is a cofibration, then the induced map is a cofibration. The mapping cylinder can be understood as the pushout of i : A → X {\displaystyle i\colon A\to X} and the embedding (at one end of the unit interval) i 0 : A → A × I {\displaystyle i_{0}\colon A\to A ...

  3. Antiparallelogram - Wikipedia

    en.wikipedia.org/wiki/Antiparallelogram

    Like a parallelogram, an antiparallelogram has two opposite pairs of equal-length sides, but these pairs of sides are not in general parallel. Instead, each pair of sides is antiparallel with respect to the other, with sides in the longer pair crossing each other as in a scissors mechanism. Whereas a parallelogram's opposite angles are equal ...

  4. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    The base pairs form a parallelogram with half the area of the quadrilateral, A q, as the sum of the areas of the four large triangles, A l is 2 A q (each of the two pairs reconstructs the quadrilateral) while that of the small triangles, A s is a quarter of A l (half linear dimensions yields quarter area), and the area of the parallelogram is A ...

  5. Quaternion - Wikipedia

    en.wikipedia.org/wiki/Quaternion

    Topics in physics and geometry that would now be described using vectors, such as kinematics in space and Maxwell's equations, were described entirely in terms of quaternions. There was even a professional research association, the Quaternion Society , devoted to the study of quaternions and other hypercomplex number systems.

  6. Fibration - Wikipedia

    en.wikipedia.org/wiki/Fibration

    A mapping : between total spaces of two fibrations : and : with the same base space is a fibration homomorphism if the following diagram commutes: . The mapping is a fiber homotopy equivalence if in addition a fibration homomorphism : exists, such that the mappings and are homotopic, by fibration homomorphisms, to the identities and . [2]: 405-406

  7. Rational mapping - Wikipedia

    en.wikipedia.org/wiki/Rational_mapping

    Formally, a rational map: between two varieties is an equivalence class of pairs (,) in which is a morphism of varieties from a non-empty open set to , and two such pairs (,) and (′ ′, ′) are considered equivalent if and ′ ′ coincide on the intersection ′ (this is, in particular, vacuously true if the intersection is empty, but since is assumed irreducible, this is impossible).

  8. Relative homology - Wikipedia

    en.wikipedia.org/wiki/Relative_homology

    In fact, this map is exactly the induced map on homology groups, but it descends to the quotient. Let ( X , A ) {\displaystyle (X,A)} and ( Y , B ) {\displaystyle (Y,B)} be pairs of spaces such that A ⊆ X {\displaystyle A\subseteq X} and B ⊆ Y {\displaystyle B\subseteq Y} , and let f : X → Y {\displaystyle f\colon X\to Y} be a continuous map.

  9. Product (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Product_(mathematics)

    In mathematics, a product is the result of multiplication, or an expression that identifies objects (numbers or variables) to be multiplied, called factors. For example, 21 is the product of 3 and 7 (the result of multiplication), and x ⋅ ( 2 + x ) {\displaystyle x\cdot (2+x)} is the product of x {\displaystyle x} and ( 2 + x ) {\displaystyle ...

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