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I'm not sure what the professor meant. The computable functions topic is not in our textbook.

Show that for every u in S*, Fu is extendable.

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I'm afraid I also have no idea. Perhaps you can copy the definition of "extendable" from your textbook. If you can't find it, tell us which textbook it is and on what page. – Yuval Filmus Oct 7 '12 at 0:05
lol. That's exactly the point, this topic is not from the textbook. The professor explained it in class. – Mike Oct 7 '12 at 0:11
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It would also be nice to know what "S*" and "Fu" means. We were not in that classroom. I'm closing the question for now since it is unlikely to be answered. Please edit in more detail and flag for reopening. – Raphael♦ Oct 7 '12 at 12:53
We cannot read your instructor's mind. You should ask him/her. – Kaveh Oct 9 '12 at 3:27

closed as not a real question by Raphael♦ Oct 7 '12 at 12:53

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, see the FAQ.