Quelle appsimple.xml Sprache: XML

<Section Label="simple">
<Heading>Description of the simple Lie algebras</Heading>

If <A>F</A> is a finite field, then, up to isomorphism,
there is precisely one simple Lie algebra with
dimension 3, and another one with dimension 6;
these can be accessed by calling <A>NonSolvableLieAlgebra(F,[3,1])</A> and
<A>NonSolvableLieAlgebra(F,[6,2])</A> (see <A>NonSolvableLieAlgebra</A> for
the details).
Over a field of characteristic 5, there is an additional simple Lie algebra with
dimension 5, namely <A>NonSolvableLieAlgebra(F,[5,3])</A>. These are the only
isomorphism types of simple Lie algebras over finite fields up to dimension 6.

<P/>
In addition to the algebras above the package contains the simple Lie algebras
of dimension between 7 and 9 over <A>GF(2)</A>. These Lie algebras were
determined by <Cite Key="VL"/> and can be described as follows.

<P/>
There are two isomorphism classes of 7-dimensional Lie algebras over
<A>GF(2)</A>. In a basis <M>b1,\ldots,b7</M> the non-trivial products
in the first algebra are

<Verb>
[b1,b2]=b3, [b1,b3]=b4, [b1,b4]=b5, [b1,b5]=b6
[b1,b6]=b7, [b1,b7]=b1, [b2,b7]=b2, [b3,b6]=b2,
[b4,b5]=b2, [b4,b6]=b3, [b4,b7]=b4, [b6,b7]=b6;
</Verb>

and those in the second are
<Verb>
[b1,b2]=b3, [b1,b3]=b1+b4, [b1,b4]=b5, [b1,b5]=b6,
[b1,b6]=b7, [b2,b3]=b2, [b2,b5]=b2+b4, [b2,b6]=b5,
[b2,b7]=b1+b4, [b3,b4]=b2+b4, [b3,b5]=b3, [b3,b6]=b1+b4+b6,
[b3,b7]=b5, [b4,b7]=b6, [b5,b6]=b6, [b5,b7]=b7.
</Verb>

<P/>Over <A>GF(2)</A> there are two isomorphism types of simple Lie algebras with
dimension 8. In the basis <M>b1,\ldots,b8</M> the non-trivial products for
the first one are

<Verb>
[b1,b3]=b5, [b1,b4]=b6, [b1,b7]=b2, [b1,b8]=b1, [b2,b3]=b7, [b2,b4]=b5+b8,
[b2,b5]=b2, [b2,b6]=b1, [b2,b8]=b2, [b3,b6]=b4, [b3,b8]=b3, [b4,b5]=b4,
[b4,b7]=b3, [b4,b8]=b4, [b5,b6]=b6, [b5,b7]=b7, [b6,b7]=b8;
</Verb>

and for the second one they are
<Verb>
[b1,b2]=b3, [b1,b3]=b2+b5, [b1,b4]=b6, [b1,b5]=b2, [b1,b6]=b1+b4+b8,
[b1,b8]=b4, [b2,b3]=b4, [b2,b4]=b1, [b2,b5]=b6, [b2,b6]=b2+b7,
[b2,b7]=b2+b5, [b3,b4]=b2+b7, [b3,b5]=b1+b4+b8, [b3,b6]=b1, [b3,b7]=b2+b3,
[b3,b8]=b1, [b4,b5]=b3, [b4,b6]=b2+b4, [b4,b7]=b1+b4+b8, [b4,b8]=b3,
[b5,b6]=b1+b2+b5, [b5,b7]=b3, [b5,b8]=b2+b7, [b6,b7]=b4+b6, [b6,b8]=b2+b5,
[b7,b8]=b6.
</Verb>

<P/>The non-trivial products for the unique simple Lie algebra with dimension 9
over <A>GF(2)</A> are as follows:

<Verb>
[b1,b2]=b3, [b1,b3]=b5, [b1,b5]=b6, [b1,b6]=b7, [b1,b7]=b6+b9,
[b1,b9]=b2, [b2,b3]=b4, [b2,b4]=b6, [b2,b6]=b8, [b2,b8]=b6+b9,
[b2,b9]=b1, [b3,b4]=b7, [b3,b5]=b8, [b3,b7]=b1+b8, [b3,b8]=b2+b7,
[b4,b5]=b6+b9, [b4,b6]=b2+b7, [b4,b7]=b3+b6+b9, [b4,b9]=b5,
[b5,b6]=b1+b8, [b5,b8]=b3+b6+b9, [b5,b9]=b4, [b6,b7]=b1+b4+b8,
[b6,b8]=b2+b5+b7, [b7,b8]=b3+b9, [b7,b9]=b8, [b8,b9]=b7.
</Verb>

</Section>

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