69. ??????????, ???????? ?? ??????? ?? ????????? ? ????????? ???????? ? ????????? ?????? ????????? ?????? ???? \( \left(\begin{array}{cc}\alpha & -\beta \\ \beta & \alpha\end{array}\right) \), ??? \( \alpha \) ? \( \beta \) ???????????? ?????.
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Closure under addition: If we add two matrices of the given form, we get another matrix of the same form. So, the set is closed under addition. Show more…
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