homology

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

7 of History's Most Notorious Serial Killers

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

United States Electoral College votes by state

How Many Electoral College Votes Does Each U.S. State Have?

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10 Greatest Baseball Players of All Time

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

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Topics

homology group Eilenberg-Steenrod axioms K-theory topological space homotopy metric space Hausdorff space compactness manifold