9a11cfaf-b87f-4d6b-9321-84972669fce9 23 Johannes Piel 4 5 decimal

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i j k ε I 3 identity : I i col I j col I k col augment det 21 line :

Example, Crossproduct:

a a.1 a.2 a.3 31 mat :

b b.1 b.2 b.3 31 mat :

I 3 identity :

M 3 identity : 10001000133 mat

i 13 range :

ê i el I i col :

Vectorise Diagonal M Dia Diagonal elements i 1 M rows range Dia i el M i i el : for Dia 31 line :

Ω M Dia :

M Dia 11131 mat

symbolic a i el b j el * Ω k el * k 13 sum j 13 sum i 13 sum :

symbolic 9 b.2 b.1 + b.3 + (2^* a.1 a.2 + (* a.3 2 b.3 * 3 b.2 b.1 + (* + b.3 + (* b.3 * + b.3 /

a.1 a.2 a.3 31 mat 11131 mat :

b.1 b.2 b.3 31 mat 12331 mat :

symbolic 54