Stack Overflow
Q&A for professional and enthusiast programmers
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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MathOverflow
Q&A for professional mathematicians
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Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
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Academia
Q&A for academics and those enrolled in higher education
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Super User
Q&A for computer enthusiasts and power users
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Ask Ubuntu
Q&A for Ubuntu users and developers
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