e/Involutory matrix

Information
has gloss	eng: In mathematics, an involutory matrix is a matrix that is its own inverse. That is, matrix A is an involution iff A2 = I. One of the three classes of elementary matrix is involutory, namely the row-interchange elementary matrix. A special case of another class of elementary matrix, that which represents multiplication of a row or column by −1, is also involutory; it is in fact a trivial example of a signature matrix, all of which are involutory.
lexicalization	eng: involutory matrix
instance of	(noun) (mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules matrix

Meaning
Italian
has gloss	ita: In matematica per matrice involutoria si intende una matrice che coincide con la propria inversa; si tratta quindi di un caso particolare di matrice invertibile. In particolare le matrici involutive o involuzioni soddisfano l'equazione:
lexicalization	ita: Matrice involutoria