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I have a question regarding upper triangular matrix.

I know that if AB is upper triangular then the |AB| equals to the diagnoal multiplication, but It doesn't seem to help me here.

If AB is upper triangular and non-singular then A and B both upper triangular?

Notice that A and B are both square.

I can't choose AB = 0 becuase its signular....

  • 0
    Are $A,B$ square?2012-10-29
  • 0
    Yes they are both square matrices2012-10-29
  • 0
    Never mind, didn't read the question properly...2012-10-29

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