Invertible (English)
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Definition (keystage 2)
Something which has an inverse. For instance, 5 is an invertible number, but 0 is not.
Definition (keystage 3)
Something is invertible if it can be inverted. So a number is invertible if it is not zero.
A square matrix is invertible if its determinant is not zero.
A square matrix is invertible if its determinant is not zero.
Definition (undergraduate level)
Having an inverse, usually a multiplicative one.
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