- #1
Brutus
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Homework Statement
Is the following true for matrices?
Hypotesis:
AB = AC
A != 0(zero matrix)
Thesis:
B=C
The Attempt at a Solution
AB = AC
AB - AC = 0(zero matrix)
AB - AC = A(B-C) // using the following property: A(B+C) = AB + AC iff A is mn matrix and BC are np matrices
A(B-C) = 0 <=> B=C because A != 0
QED
There is something wrong because there are matrices where AB = AC and B != C.
Where is my mistake?