Euler number 2

Euler number 2

[′ȯi·lər ‚nəm·bər ′tü]
(fluid mechanics)
A dimensionless number equal to two times the Fanning friction factor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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This means that for any polyhedron having Euler number 2, T = 4[pi], or 720[degrees].
Angle defect and Descartes' theorem

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