Give an example of a connected semi-Riemannian manifold that is complete at one point but not complete.
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Welcome to Mathematics! Please read this post and the others there for information on writing a good question for this site. In particular, people will be more willing to help if you [edit] your question to include some motivation, and an explanation of your own attempts. – Lord_Farin Feb 08 '15 at 09:41
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3@Pp.. As you very well know, this kind of posing as the OP is very controversial to say the least. If you are going to do it, please identify yourself in the comments or otherwise and do not put words in OP's mouth. – Lord_Farin Feb 08 '15 at 15:34
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I think this is true but I need another example. – Parisa432 Feb 08 '15 at 19:44