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Grassmann Algebra

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ExploringClifford<strong>Algebra</strong>.nb 52<br />

Step 1: Replace symbols for entities and operations<br />

C7 � �C6 �� ReplaceNegativeUnit� �. �1 ��,e1 �Γ0 ,<br />

e2 �Γ1 ,e3 �Γ2, e4 �Γ3 ��. Wedge � Dot; PaletteForm�C7 �<br />

� Γ 0 Γ 1 Γ 2 Γ 3<br />

Γ 0 � Γ 0.Γ 1 Γ 0 .Γ 2 Γ 0.Γ 3<br />

Γ1 �Γ0.Γ1 �� Γ1 .Γ2 Γ1.Γ3<br />

Γ2 �Γ0.Γ2 �Γ1 .Γ2 �� Γ2.Γ3<br />

Γ3 �Γ0.Γ3 �Γ1 .Γ3 �Γ2.Γ3 ��<br />

Γ0.Γ1 �Γ1 �Γ0 Γ0 .Γ1.Γ2 Γ0 .Γ1 .Γ3<br />

Γ0.Γ2 �Γ2 �Γ0.Γ1 .Γ2 �Γ0 Γ0 .Γ2 .Γ3<br />

Γ 0.Γ 3 �Γ 3 �Γ 0.Γ 1 .Γ 3 �Γ 0 .Γ 2 .Γ 3 �Γ 0<br />

Γ 1.Γ 2 Γ 0 .Γ 1 .Γ 2 Γ 2 �Γ 1 Γ 1 .Γ 2 .Γ 3<br />

Γ1.Γ3 Γ0 .Γ1 .Γ3 Γ3 �Γ1 .Γ2 .Γ3 �Γ1<br />

Γ2.Γ3 Γ0 .Γ2 .Γ3 Γ1 .Γ2 .Γ3 Γ3 �Γ2<br />

Γ0 .Γ1 .Γ2 Γ1.Γ2 Γ0.Γ2 �Γ0.Γ1 Γ0.Γ1.Γ2 .Γ3<br />

Γ0 .Γ1 .Γ3 Γ1.Γ3 Γ0.Γ3 �Γ0 .Γ1.Γ2.Γ3 �Γ0 .Γ1<br />

Γ0 .Γ2 .Γ3 Γ2.Γ3 Γ0.Γ1.Γ2.Γ3 Γ0 .Γ3 �Γ0 .Γ2<br />

Γ 1 .Γ 2 .Γ 3 �Γ 0 .Γ 1.Γ 2.Γ 3 �Γ 2 .Γ 3 Γ 1 .Γ 3 �Γ 1 .Γ 2<br />

Γ0 .Γ1.Γ2.Γ3 �Γ1 .Γ2 .Γ3 �Γ0.Γ2 .Γ3 Γ0 .Γ1.Γ3 �Γ0 .Γ1 .Γ2<br />

Step 2: Substitute matrices and calculate<br />

2001 4 26<br />

� 1 0 0 0<br />

������������<br />

�������������<br />

� 1 0 0 0<br />

������������<br />

�������������<br />

� 0 0 0 �1<br />

������������<br />

0 1 0 0<br />

0 1 0 0<br />

0 0 �1 0<br />

C8 � C7 �. �� �<br />

, Γ0 �<br />

, Γ1 �<br />

0 0 1 0<br />

0 0 �1 0<br />

0 1 0 0<br />

� 0 0 0 1 � � 0 0 0 �1 � � 1 0 0 0<br />

Γ2 �<br />

� 0 0 0 �<br />

������������<br />

�������������<br />

� 0 0 �1 0<br />

������������<br />

�������������<br />

0 0 �� 0<br />

0 0 0 1<br />

, Γ3 �<br />

�; MatrixForm�C8 �<br />

0 �� 0 0<br />

1 0 0 0<br />

� � 0 0 0 � � 0 �1 0 0 �<br />

�<br />

������������<br />

,<br />

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