manifold

Table of Contents

Introduction References & Edit History Related Topics

Discover

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

Internet http://www blue screen. Hompepage blog 2009, history and society, media news television, crowd opinion protest, In the News 2009, breaking news

Who Invented the Internet?

Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

manifold: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Topics

Poincaré conjecture Betti number cobordism h-cobordism theorem curvature vector tangent vector topological space metric space Hausdorff space homotopy homology compactness

Key People

Bernhard Riemann, lithograph after a portrait, artist unknown, 1863.

Bernhard Riemann

German mathematician

Grigori Perelman

Russian mathematician

Sergei Novikov

Russian mathematician

William Paul Thurston

American mathematician

Kodaira Kunihiko

Kodaira Kunihiko

Japanese mathematician

Curtis McMullen

American mathematician

Quiz

Equations written on blackboard

Numbers and Mathematics