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There is known a lot about semigroups, mostly about their inner structure etc. But is there any use of semigroups in the general Maths -- like that of groups?

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closed as not a real question by Daniel Moskovich, Nate Eldredge, Zev Chonoles, Simon Thomas, George Lowther Feb 16 '11 at 14:53

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

A similar (but to my mind much better) question is… I don't think this question is well-posed. Why is the wikipedia answer insufficient? – Daniel Moskovich Feb 16 '11 at 14:22
Without saying what you mean by "the general Maths" this question is, as Daniel says, not well-posed. – Yemon Choi Feb 16 '11 at 20:31
The question has been re-asked at – Yemon Choi Feb 18 '11 at 19:55