I have a question that comes up when writing mathematical problems.

Which of the following is correct:

The problem is well-posed


The problem is well posed.

I am sure the second is correct. However the first is used in all sorts of papers, books and Wikipedia.

marked as duplicate by user140086, FumbleFingers, Nathaniel, choster, Hellion Jan 14 '16 at 20:28

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The hyphen means that the two words are acting as a unit. In other words, it is a choice between whether or not well is describing the word posed. If it is, then don't use a hyphen. Otherwise, put the hyphen.

There is no reason to use a hyphen because it is clear that well is describing posed--how is the problem posed? Well. Therefore, you should not use a hyphen.

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