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F4 (Mathematics)In mathematics, F4 is the name of a Lie group and also its Lie algebra . It is one of the five exceptional simple Lie groups. F4 has rank 4 and dimension 52. Its center is the trivial subgroup. Its outer automorphism group is the trivial group. Its fundamental representation is 26-dimensional. Algebra The F4 Lie algebra may be constructed by adding 16 generators transforming as a spinor to the 36-dimensional Lie algebra so(9), in analogy with the construction of E8. Dynkin diagram of F_4 Roots of F4 -
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Simple roots -
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Weyl/Coxeter group Its Weyl/Coxeter group is the symmetry group of the 24-cell. -
\begin{pmatrix} 2&-1&0&0\\ -1&2&-2&0\\ 0&-1&2&-1\\ 0&0&-1&2 \end{pmatrix} F4 lattice The F4 lattice is a four dimensional body-centered cubic lattice (i.e. the union of two hypercubic lattices, each lying in the center of the other). They form a ring called the Hurwitz quaternion ring.
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