mistake

0 Tareq Musa · February 16, 2015
in video tutorials algebra basic 20th video at 3:13 min.

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0 Alex Micharski · February 22, 2015
The instructor probably thinks 9+10=21.
0 Arnold Janssen · March 7, 2015
 I would be very glad if you could help me understand and solve these questions.



1) Suppose E1;E2;E3 are 4 by 4 identity matrices, except E1 has a;b;c in column 1 and E2 has d;e in column 2 and E3 has f in column 3 (below the 1’s). Multiply L =E1.E2.E3 to show that all these nonzeros are copied into L.

E1E2E3 is in the opposite order from elimination (because E3 is acting ?rst). But E1E2E3 =L is in the correct order to invert elimination and recover A.
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