Difference between revisions of "Identity matrix"

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In [[matrix algebra]], the '''identity matrix''' is a [[square matrix]] which has all the entries on the main [[diagonal]] equal to one and all the other, off-diagonal, entries equal to zero.  The identity matrix acts as the [[identity element]] for [[matrix multiplication]].
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In [[matrix algebra]], the '''identity matrix''' is a [[square matrix]] which has all the entries on the main [[diagonal]] equal to one and all the other, off-diagonal, entries equal to zero.  The identity matrix acts as the [[identity element]] for [[matrix multiplication]].  Its entries are those of the [[Kronecker delta]].

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In matrix algebra, the identity matrix is a square matrix which has all the entries on the main diagonal equal to one and all the other, off-diagonal, entries equal to zero. The identity matrix acts as the identity element for matrix multiplication. Its entries are those of the Kronecker delta.