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• ### Retract

neighborhood retract (ANR) is a particularly well-behaved type of topological space. For example

• ### Section (category theory)

, a retraction is a left inverse of some morphism.In other words, if f : X → Y and g : Y → X

• ### Homotopy

In topology, two continuous functions from one topological space to another are called homotopic (from Greek ὁμός homós "same, similar" and τόπος tópos "place") if one can be "continuously deformed" into the other, such a deformation being called a homotopy between the two functions. A notable use of homotopy is the definition of homotopy groups and cohomotopy groups, important invariants in algebraic topology. In practice, there are technical difficulties in using homotopies with certain spaces. Algebraic topologists work with compactly generated spaces, CW complexes, or spectra.

• ### Florida Reef

The Florida Reef (also known as the Great Florida Reef, Florida reefs, Florida Reef Tract and Florida Keys Reef Tract) is the only living coral barrier reef in the continental United States. It is the third largest coral barrier reef system in the world (after the Great Barrier Reef and Belize Barrier Reef). It lies a few miles seaward of the Florida Keys, is about 4 miles (6 to 7 km) wide and extends (along the 20 meter depth contour) 270 km (170 mi) from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys. The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west. The rest of the reef outside Biscayne National P

• ### Retract (group theory)

In mathematics, in the field of group theory, a subgroup of a group is termed a retract

• ### Great Retreat

The Great Retreat, (French: La Grande Retraite) also known as the Retreat from Mons, is the name

• ### Rural Retreat, Virginia

Rural Retreat is a town in Wythe County, Virginia, United States. The population was 1,483 at the 2010 census.

• ### Retreat (spiritual)

The meaning of a spiritual retreat can be different for different religious communities. Spiritual

• ### ReactOS

ReactOS is a free and open-source operating system for amd64/i686 personal computers intended to be binary-compatible with computer programs and device drivers made for Windows Server 2003 and later versions of Windows. ReactOS has been noted as a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs.

• ### Hermitage (religious retreat)

Although today's meaning is usually a place where a hermit lives in seclusion from the world, hermitage was more commonly used to mean a building or settlement where a person or a group of people lived religiously, in seclusion. When included in the name of continental European properties or churches, any meaning is often imprecise, and may refer to some distant period of the history of what is today a property that is either a normal parish church, or ceased to have any religious function some time ago. Secondary churches or establishments run from a monastery were often called "hermitages".

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