manifold

Table of Contents

Introduction References & Edit History Related Topics

Discover

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

World Data Locator Map: Australia

Is Australia an Island?

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

manifold: Related Content

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

Topics

Poincaré conjecture cobordism Betti number 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

William Paul Thurston

American mathematician

Kodaira Kunihiko

Kodaira Kunihiko

Japanese mathematician

Sergei Novikov

Russian mathematician

Curtis McMullen

American mathematician

Quiz

Equations written on blackboard

Numbers and Mathematics