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Wikipedia [note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki -based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.
The most common free software license, the GNU General Public License (GPL), is a form of copyleft and is used for the Linux kernel and many of the components from the GNU Project. [88] Linux-based distributions are intended by developers for interoperability with other operating systems and established computing standards.
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en.wikipedia.org
55.263 494 06. e2 ⋅ eV −1 ⋅ μm −1. Vacuum permittivity, commonly denoted ε0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum. It may also be referred to as the permittivity of free space, the electric constant, or the distributed capacitance of the vacuum.
The English word "free" has several meanings. The word "free" in "The Free Encyclopedia" refers first and foremost to the licensing terms of Wikipedia's content. Text is contributed to Wikipedia under the terms of the Creative Commons Attribution-ShareAlike License (CC-BY-SA) and the GNU Free Documentation License (GFDL) — copyleft licenses ...