irrational number

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Unusual Counting Systems

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Is Zero an Even or an Odd Number?

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How Fast Is the Universe Expanding?

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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

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Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

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Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

Where Do Anti-Semitic Conspiracy Theories About the Rothschild Family Come From?

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

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Topics

golden ratio e number complex number real number algebraic number rational number integer perfect number transfinite number prime scientific notation significant figures

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arithmetic: Rational numbers

Key People

Eudoxus of Cnidus

Greek mathematician and astronomer

Dedekind

Richard Dedekind

German mathematician

Johann Lambert, detail of a lithograph by Gottfried Englemann, after a portrait by Pierre-Roch Vigneron

Johann Heinrich Lambert

Swiss-German scientist and philosopher

René-Louis Baire

French mathematician

Theaetetus

Greek mathematician

Quiz

Equations written on blackboard

Numbers and Mathematics

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math