TITLE: What is the Beilinson regulator?
QUESTION [8 upvotes]: Trying to understand answer to this question.
What is the (Beilinson) higher regulator of a number field?

REPLY [27 votes]: Many, many years ago I happened to be in the room when somebody asked exactly the same question --- "What is the Beilinson regulator?" --- of Marc Levine.  Marc went straight to the blackboard and drew the key diagram that makes everything clear.  I knew it had to be preserved for posterity, so I ran across the street to buy a disposable camera.  I am delighted to be able to share this:

(Click picture for larger version.)