国上活天大峰 -1- ixj=k jxi=-kj×k=ikxi=-i kxi=j ixk=-j i×i=j×j=k×k=0 i.i=jj=k.k=1 i.j=j.k=k.i=0 圆上泽夫大峰 commutative BxA=-AxB. A.B=B.A Distributive AX(B+C)=A×B+A×C A.(B+C)=A.B+A.C Triple Product 44,4 A(B×C)=B.(C×A)=C.(A×B)=BB,B c.c,c. A×(B·C)=(A.C)B-(A.B)C (A×B)×C=(A.C)B-(B.C)A 0 k i j i k j i i j j k k i j k j i k j k i k j i i.i j.j k.k 1 i.j j.k k.i 0 BA AB. A.B B.A A (B C) A B AC A.(B C) A.B A.C commutative Distributive ( )( )( ) ; xyz xyz x y z A A A B B B CCC A. B C B. C A C. A B ( )( ) ( ) ( ) ( )() A B C A.C B A.B C A B C A.C B B.C A Triple Product