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{{Short description|Square matrix that is a generalization of the Hadamard matrix}}
In [[mathematics]], a '''jacket matrix''' is a [[square symmetric matrix]] <math>A= (a_{ij})</math> of order ''n'' if its entries are non-zero and [[real number|real]], [[complex number|complex]], or from a [[finite field]], and [[File:Had_otr_jac.png|thumb|Hierarchy of matrix types]]
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where ''T'' denotes the [[transpose]] of the matrix.
In other words, the inverse of a jacket matrix is determined by its element-wise or block-wise inverse. The definition above may also be expressed as:
:<math>\forall u,v \in \{1,2,\dots,n\}:~a_{iu},a_{iv} \neq 0, ~~~~ \sum_{i=1}^n a_{iu}^{-1}\,a_{iv} =
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<math>\mathbf {A_j}=\mathrm{diag}(A_1, A_2,.. A_n )</math>
denotes an mn x mn [[Block matrix|block diagonal]] Jacket matrix.
:<math>
J_4 = \left[ \begin{array}{rrrr} I_2 & 0 & 0 & 0 \\ 0 & \cos\theta & -\sin\theta & 0 \\ 0 & \sin\theta & \cos\theta & 0 \\
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:<math>
[\mathbf {A}]_N= \left[ \begin{array}{rrrr} \mathbf {A}_0 & \mathbf {A}_1 \\ \mathbf {A}_1 & \mathbf {A}_0 \\ \end{array} \right],</math>.
If <math>[\mathbf {A}_0]_p</math> and <math>[\mathbf {A}_1]_p</math> are pxp Jacket matrix, then <math>[A]_N</math> is a block [[circulant matrix]] if and only if <math>\mathbf {A}_0 \mathbf {A}_1^{rt}+\mathbf {A}_1^{rt}\mathbf {A}_0</math>, where rt denotes the reciprocal transpose.
== Example 5. ==
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:<math>[\mathbf {A}]_4 </math>⇒<math>
\left[ \begin{array}{rrrr} U & C & A & G\\ \end{array} \right]^T\otimes\left[ \begin{array}{rrrr} U & C & A & G\\ \end{array} \right]\otimes\left[ \begin{array}{rrrr} U & C & A & G\\ \end{array} \right]^T, </math>
where ''U'', ''C'', ''A'', ''G'' denotes the amount of the DNA nucleobases and the matrix <math>[\mathbf {A}]_4 </math> is the block circulant Jacket matrix which leads to the principle of the Antagonism with Nirenberg [[Genetic code|Genetic Code]] matrix.
== References ==
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* [https://www.researchgate.net/publication/342195507_Jacket_Matrices_-Construction_and_Its_Applications_for_Fast_Cooperative_Wireless_Signal_Processing: Jacket Matrices: Constructions and Its Applications for Fast Cooperative Wireless Signal Processing]
[[Category:Matrices (mathematics)]]
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