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added a sentence to the ref manual subsection on direct sums of algebras #5763

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added a sentence to the ref manual subsection on direct sums of algebras #5763

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4 changes: 4 additions & 0 deletions lib/algebra.gd
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Expand Up @@ -581,6 +581,10 @@ DeclareOperation( "ProductSpace", [ IsFreeLeftModule, IsFreeLeftModule ] );
## If all involved algebras are matrix algebras, and either both are Lie
## algebras or both are associative then the result is again a
## matrix algebra of the appropriate type.
## <P/>
## Experimental methods for <C>Embedding</C> and <C>Projection</C>
## for direct sums of algebras are included in version 1.26 of package
## <Package>XModAlg</Package>.
## <Example><![CDATA[
## gap> A:= QuaternionAlgebra( Rationals );;
## gap> DirectSumOfAlgebras( [A, A, A] );
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