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Prove that diagonal elements of a skew s...

Prove that diagonal elements of a skew symmetric matrix are all zeroes.

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`A=[a_(ij)]_(n*m)`
Skew symmetric means
`a_(ij)=-a_(ji)`
`i=j`
`a_(ii)=-a_(ii)`
`2a_(ii)=0`
`a_(ii)=0`
`a_(ii)` are demts onthe main digonal they are all zero.
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