I am really sorry, it has been a while since I am back on Math.SE, and since when when does MathOverflow become one of SE family? Won't Math.SE and MathOverflow overlap each other?

  • $\begingroup$ MO is for research level math, and anything below is off-topic. MSE is for all kinds of math. $\endgroup$ – user61527 Jan 30 '14 at 2:58
  • $\begingroup$ @T.Bongers So what does the MSE community say about this? There must be some heated discussions. $\endgroup$ – Ave Maleficum Jan 30 '14 at 2:59
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    $\begingroup$ MO has been part of the SE network since last June. There's really very little overlap or competition between the sites, and I'm not sure what there'd be heated discussions about. $\endgroup$ – user61527 Jan 30 '14 at 3:10
  • $\begingroup$ @T.Bongers Oh, don't worry about that -- people are apt to find things to have heated discussions about. Like hypothetical migrations. $\endgroup$ – you can call me Al Jan 30 '14 at 4:59
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    $\begingroup$ Related, and possibly duplicate of: meta.math.stackexchange.com/questions/10067/… $\endgroup$ – Willie Wong Jan 30 '14 at 7:36
  • $\begingroup$ There were some heated discussions at MO, not so much at m.se. $\endgroup$ – Gerry Myerson Jan 30 '14 at 19:52

Since June 25, 2013. See: MathOverflow 2.0, History of MathOverflow. Generally, meta.MO is a better place for questions about MathOverflow.

The sites (oops, they are no longer sites but communities) are quite different in their focus and thus they complement each other instead of being competitors. Occasionally, people ask:

If I have a maths question, on which site should I ask: MathOverflow or Mathematics.SE?

to which there is a simple answer:

If you have to ask, math.SE

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    $\begingroup$ I think this is a great response. I agree - if you have to ask, use MSE. $\endgroup$ – davidlowryduda Jan 30 '14 at 5:30
  • $\begingroup$ (this is the very reason why I stick with MSE, indeed...) $\endgroup$ – mau Jan 30 '14 at 12:54

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