A121739 - OEIS

A121739

Dimensions of the irreducible representations of the simple Lie algebra of type D4 over the complex numbers, listed in increasing order.

1, 8, 28, 35, 56, 112, 160, 224, 294, 300, 350, 567, 672, 840, 1296, 1386, 1400, 1568, 1680, 1925, 2400, 2640, 2800, 3675, 3696, 4096, 4312, 4536, 4719, 5775, 6160, 6600, 7392, 7776, 7840, 8008, 8800, 8910, 8918, 10752, 12320, 12936, 13013, 13728, 15015

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

We include "1" for the 1-dimensional 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 4-6, 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, Triality

FORMULA

Given a vector of 4 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 0000 corresponds to the 1-dimensional module on which D4 acts trivially. The second second term in the sequence is 8, corresponding to the three inequivalent representations with highest weights 1000, 0010 and 0001 respectively. The third term in the sequence is 28, corresponding to the adjoint representation, which has highest weight 0100.

PROG

(GAP) # see program at sequence A121732

CROSSREFS

Cf. A121732, A121736, A121737, A121738, A104599.

Sequence in context: A006377 A319233 A323198 * A166729 A202290 A131850

Adjacent sequences: A121736 A121737 A121738 * A121740 A121741 A121742

KEYWORD

nonn

AUTHOR

Skip Garibaldi (skip(AT)member.ams.org), Aug 19 2006

STATUS

approved