What is Torsion-free abelian group?

Free convolution is the free probability analog of the classical notion of convolution of probability measures. Due to the non-commutative nature of free probability theory, one has to talk separately...

Goal-free evaluation is any evaluation in which the evaluator conducts the evaluation without particular knowledge of or reference to stated or predetermined goals and objectives. This external evaluation model typically...

Car-free walking is a movement in the United Kingdom that aims to encourage people who take recreational walks to use public transport instead of a car to get to their...

In mathematics, a free Boolean algebra is a Boolean algebra with a distinguished set of elements, called generators, such that:

In mathematics, the category Ab has the abelian groups as objects and group homomorphisms as morphisms. This is the prototype of an abelian category: indeed, every small abelian category can...

In mathematics, in the area of order theory, a free lattice is the free object corresponding to a lattice. As free objects, they have the universal property.

In economics and social choice theory, an envy-free matching is a matching between people to "things", which is envy-free in the sense that no person would like to switch his...

A free hosted gallery is a web page of sample content which is provided at no charge to affiliates of subscription websites. Affiliates promote these galleries to web surfers in...

In several mathematical areas, including harmonic analysis, topology, and number theory, locally compact abelian groups are abelian groups which have a particularly convenient topology on them. For example, the group...

A scale-free network is a type of networks that is of particular interest of network science. It is characterized by its degree distribution following a power law. While the most...