The old meta had a convenient link back to the main mathoverflow site, but that seems to have vanished. It would be nice to have it back.
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$\begingroup$ You may also click on the StackExchange logo in the top left hand corner. $\endgroup$ – skullpetrol May 22 '16 at 20:42
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You have it on the top bar, right by your user name and reputation: "main".
