** Category of abelian groups Ab has abelian groups as objects and group homomorphisms as morphisms

** 107 of the 142 books of Ab Urbe Condita ( book ), a history of Rome

** Ab Aquapendente Opera Chirurgica, Venice 1619

** Ab, the category of abelian groups, with the group of integers Z serving as the unit.

** P26 – Ketereh – Ab Aziz Ab Kadir

** P27 – Tanah Merah – Amran Ab Ghani

** Scherzo in Ab ( rec.

** Gliese 777 Ab

** The Baire category theorem about complete metric spaces, and its consequences, such as the open mapping theorem and the closed graph theorem.

** In the category of Riemann surfaces, an automorphism is a bijective biholomorphic map ( also called a conformal map ), from a surface to itself.

** Systems Biology comes under this category including reaction fluxes and variable concentrations of metabolites

** Dual ( category theory ), a formalization of mathematical duality

** Concept learning is the induction of a concept ( category ) from observations

** Inform category: A Change in the Weather by Andrew Plotkin

** TADS category: Uncle Zebulon's Will by Magnus Olsson

** Limit ( category theory )

** Chamois leather also falls into the category of aldehyde tanning and like brain tanning produces a highly water absorbent leather.

** the materials are subject to a subpoena-although many practitioners regard that fact as a category of permissible disclosure, not as a categorical exclusion from confidentiality ( because court-ordered secrecy provisions may apply even in case of a subpoena ).

** the product category, a category that is the product of categories.

** A devastating category 4 Cyclone strikes Andhra Pradesh, India.

** Hondo-Louis L ' Amour ( Note: Originally announced on February 15, 1954 as a nominee in this category.

** Poultry – category of domesticated birds kept by humans for the purpose of collecting their eggs, or killing for their meat and / or feathers.

** the category of vector spaces over a field K.

** the category of vector spaces over a field K.

** Set, the category of sets

** Top, the category of topological spaces

** Grp, the category of groups

** Ring, the category of rings

** K-Vect, the category of vector spaces over a field K

** R-Mod, the category of modules over a commutative ring R

** CmptH, the category of all compact Hausdorff spaces

** Commutative semigroup, commutative monoid, abelian group, and commutative ring, algebraic structures with the commutative property

** free abelian group

** By the fundamental theorem of finitely generated abelian groups, it follows that abelian groups are amenable.

** The additive groups of R and C are isomorphic.

** the classical Lie groups, namely the simple groups related to the projective special linear, unitary, symplectic, or orthogonal transformations over a finite field ;

** the exceptional and twisted groups of Lie type ( including the Tits group ).

** 4 quad characters ; groups of four characters displayed in a row

** Functional groups

** Major climate groups

** Publics – groups of individuals

** The public ( a. k. a. " the general public ") – the totality of such groups.

** the product of groups, and also the semidirect product, knit product and wreath product,

** the free product of groups

** The self-description of many Salafi and Wahhabi groups

** Finite groups

** Polycyclic groups

** Negatively curved groups

** Euclidean groups

** Coxeter groups

** Braid groups

** Geometrically finite groups

** Finitely presented simple groups.

** Fundamental groups of closed orientable two-dimensional manifolds.

** In 1999, the North Atlantic Treaty Organization ( NATO ) led by the United States launched air attacks against Yugoslavia ( then composed of only Serbia and Montenegro ) to pressure the Yugoslav government to end its military operations against ethnic Albanian separatists in Kosovo due to accusations of war crimes being committed by Yugoslav military forces working alongside nationalist Serb paramilitary groups.

** Civil war in Chad ( 2005 – present ) – involved Chadian government forces and several Chadian rebel groups.

** Fosse Ardeatine massacre: 335 Italians are killed, including 75 Jews and over 200 members of the Italian Resistance from various groups, in Rome.

** The United States places an embargo on Libyan oil imports, alleging Libyan support for terrorist groups.