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How many Linux kernel developers does it take for the project to stall?
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Two different concepts.
You're talking about work slowing because of increased overhead from more people needing to communicate and make decisions.
The OP is talking about the"bus factor". How many people can leave the project unexpectedly and still have the project survive. E.g. if only one person has access to merge changes, the bus factor is 1 regardless of how many people actively contribute.