Relations With Representation Theory
Consider the following slightly more general context. Suppose that n and m are two integers and xij for i = 1,...,n,j = 1,...,m, be commuting variables. Redefine Eij by almost the same formula:
with the only difference that summation index a ranges from 1 to m. One can easily see that such operators satisfy the commutation relations:
Here denotes the commutator . These are the same commutation relations which are satisfied by the matrices which have zeros everywhere except the position (i,j), where 1 stands. ( are sometimes called matrix units). Hence we conclude that the correspondence defines a representation of the Lie algebra in the vector space of polynomials of xij.
Read more about this topic: Capelli's Identity
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“As death, when we come to consider it closely, is the true goal of our existence, I have formed during the last few years such close relations with this best and truest friend of mankind, that his image is not only no longer terrifying to me, but is indeed very soothing and consoling! And I thank my God for graciously granting me the opportunity ... of learning that death is the key which unlocks the door to our true happiness.”
—Wolfgang Amadeus Mozart (1756–1791)
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