https://**en.wikipedia.org**/wiki/**Neighbourhood_system**

In topology and related areas of mathematics, the **neighbourhood system**, complete system of neighborhoods, [1] or **neighbourhood** filter for a point x is the collection ...

https://**en.wikipedia.org**/wiki/**Neighbourhood**_(mathematics)

In a metric space, a set is a **neighbourhood of a point** if there exists an open ball with centre and radius , such that. is contained in . is called uniform ...

dictionary.sensagent.com/**neighbourhood system**/en-en

In topology and related areas of mathematics, the **neighbourhood system** or **neighbourhood** filter for a point x is the collection of all neighbourhoods for the point x.

encyclopedia2.thefreedictionary.com/**Neighbourhood+system**

Looking for **Neighbourhood system**? Find out information about **Neighbourhood system**. For a point x in a topological space, ...

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www.robx1.net/victkt/nhood/html/nhwork.htm

The Metropolitan area was divided up into 10 regionalized neighbourhoods, however, these were not necessarily centred directly over the suburb thay were named after.

citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.308.2939

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): South Africa as a regional pole for economic development in Africa

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www.emathzone.com/.../general-topology/**neighbourhood-of-a-point**.html

However, if a **neighbourhood of a point** is an open set, we call it an open **neighbourhood** of that point. ... **Neighbourhood System**: Let be a topological space.