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    I have to prove that an upper triangular matrix remains upper triangular when multiplied by a scalar. I know this is obvious but I don't know how to prove this using the notation aij.

    Help please
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    (Original post by Lunu)
    I have to prove that an upper triangular matrix remains upper triangular when multiplied by a scalar. I know this is obvious but I don't know how to prove this using the notation aij.

    Help please
    All the big purists have gone to bed early ... or watching MOTD2
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    (Original post by Lunu)
    I have to prove that an upper triangular matrix remains upper triangular when multiplied by a scalar. I know this is obvious but I don't know how to prove this using the notation aij.

    Help please
    How would you describe an upper triangular matrix, in terms of a_{i,j} ?

    If you can see that, I suspect you may then be able to answer the original question yourself.
 
 
 
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Updated: October 26, 2015
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