Neutrales Element der Multiplikation

http://maxima-online.org/?inc=r1344373592
(%i1) A:matrix([0,2,0],[0,0,4],[5,3,0]);
[ 0 2 0 ]
[ ]
(%o1) [ 0 0 4 ]
[ ]
[ 5 3 0 ]
(%i2) E1:matrix([1,0,0],[0,1,0],[0,0,1]);
[ 1 0 0 ]
[ ]
(%o2) [ 0 1 0 ]
[ ]
[ 0 0 1 ]
(%i3) A.E1;
[ 0 2 0 ]
[ ]
(%o3) [ 0 0 4 ]
[ ]
[ 5 3 0 ]
(%i4) E1.A;
[ 0 2 0 ]
[ ]
(%o4) [ 0 0 4 ]
[ ]
[ 5 3 0 ]
(%i5) B:matrix([2,3],[0,2]);
[ 2 3 ]
(%o5) [ ]
[ 0 2 ]
(%i6) E2:matrix([1,0],[0,1]);
[ 1 0 ]
(%o6) [ ]
[ 0 1 ]
(%i7) B.E2;
[ 2 3 ]
(%o7) [ ]
[ 0 2 ]
(%i8) E2.B;
[ 2 3 ]
(%o8) [ ]
[ 0 2 ]

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