A Digest on Representation Theory of the Symmetric Group
A Digest on Representation Theory of the Symmetric Group
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发表时间:
2006
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通讯作者:
K. Audenaert
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作者:
K. Audenaert
Partitions can be graphically represented by Young frames , which are Young tableaux with empty boxes. The i-th part λi corresponds to thei-th row of the frame, consisting of λi boxes. Conversely, the Young frames of n boxes can be uniquely labelled by a partitionλ ` n. We will therefore identify a Young frame with the partition labelling it. A Young tableau(YT) of N objects and of shape λ ` n is a Young frameλ in which the boxes are labelled by numbers (1, . . . , N ). A standard Young tableau (SYT) of shapeλ ` n is a Young tableau ofN = n objects such that the labels appear increasing in every row from left to right, andincreasingin every column downwards; hence every number occurs exactly once. A Semistandard Young tableau (SSYT) of shapeλ ` n is a Young tableau such that the labels appear non-decreasingin every row from left to right, andincreasingin every column downwards. The number of SSYTs of N objects and of shape λ ` n (imposing the conditionl(λ) ≤ N ) is given bysλ(1×N ); see below for an explanation. The numberf of SYTs of shapeλ ` n; r is ([6] p. 119) f = n! ∆(ν1, . . . , νr) ν1! . . . νr! , r = l(λ), (1)