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I is better than 1...
An '''invertible matrix''' ''A'' is one that has a corresponding [[matrix]] ''B'' such that:
An '''invertible matrix''' ''A'' is one that has a corresponding [[matrix]] ''B'' such that:
:''AB'' = ''BA'' = 1
:''AB'' = ''BA'' = I (I: [[identity matrix]])
A matrix is invertible if and only if it has a nonzero determinant. Only square matrices (''n'' x ''n'') are invertible.
A matrix is invertible if and only if it has a nonzero determinant. Only square matrices (''n'' x ''n'') are invertible.