Connected sum

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In mathematics, specifically in topology, the operation of connected sum is a geometric modification on manifolds. Its effect is to join two given manifolds together near a chosen point on each. This construction plays a key role in the classification of closed surfaces.

Excerpt from the Wikipedia article “Connected sum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Oleg Alexandrov (talk) 04:53, 3 July 2008 (UTC), CC BY-SA 3.0, via Wikimedia Commons.