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anonymous

  • one year ago

could anybody explain thee last step of this proof? where they say Aj1* = Aj1

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  1. anonymous
    • one year ago
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  2. amilapsn
    • one year ago
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    what's the definition of cofactor?

  3. anonymous
    • one year ago
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    Aij= (-1)i+j det Aij)

  4. phi
    • one year ago
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    given a matrix, the co-factor of a specific row if found by "crossing off" that row (and the column, for each column) if we are crossing off the jth row of both matrix A and A*, and the only difference between the matrices is the jth row, it should be clear we get the same co-factor for both matrices (when expanding along the jth row)

  5. anonymous
    • one year ago
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    thanks!

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