

A121214


Dimensions of the irreducible representations of the algebraic group SL4 (equivalently, simple Lie algebra of type A3) over the complex numbers, listed in increasing order.


4



1, 4, 6, 10, 15, 20, 35, 36, 45, 50, 56, 60, 64, 70, 84, 105, 120, 126, 140, 160, 165, 175, 189, 196, 216, 220, 224, 256, 270, 280, 286, 300, 315, 336, 360, 364, 384, 396, 420, 440, 455, 480, 500, 504, 540, 560, 594, 616, 630, 640, 680, 715, 729, 735, 750, 756
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

We include "1" for the 1dimensional trivial representation and we list each dimension once, ignoring the fact that inequivalent representations may have the same dimension.


REFERENCES

N. Bourbaki, Lie groups and Lie algebras, Chapters 46, Springer, 2002.
J. E. Humphreys, Introduction to Lie algebras and representation theory, Springer, 1997.


LINKS

Andy Huchala, Table of n, a(n) for n = 1..20000
Andy Huchala, Java program
Wikipedia, Special linear group


FORMULA

Given a vector of 3 nonnegative integers, the Weyl dimension formula tells you the dimension of the corresponding irreducible representation. The list of such dimensions is then sorted numerically.


EXAMPLE

The highest weight 000 corresponds to the 1dimensional module on which SL4 acts trivially. The standard representation and its dual have dimension 4 (the second term in the sequence) and highest weights 100 and 001. The third term in the sequence, 6, is the dimension of the representation of SL4 on the second exterior power of the standard representation; it has highest weight 010. The fourth term, 10, is the dimension of the second symmetric power of the standard representation or its dual, with highest weight 200 or 002. The fifth term, 15, corresponds to the adjoint representation with highest weight 101.


PROG

(GAP) # see program at A121732


CROSSREFS

Cf. A121732, A121741.
Sequence in context: A310585 A179445 A310586 * A219047 A116996 A004399
Adjacent sequences: A121211 A121212 A121213 * A121215 A121216 A121217


KEYWORD

nonn


AUTHOR

Skip Garibaldi (skip(AT)member.ams.org), Aug 20 2006


STATUS

approved



