Question 1161666
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On involuntary matrices, read from this Wikipedia article


https://en.wikipedia.org/wiki/Involutory_matrix#:~:text=In%20mathematics%2C%20an%20involutory%20matrix,roots%20of%20the%20identity%20matrix.



Do not forget to post your deep "THANKS" to me for pointing this very authoritative source to you (!)