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Question #47d0a

1 Answer

Mar 15, 2017

See below.

Explanation:

If #A# and #B# are non null hermitian then #"tr"(A^2) > 0# and #"tr"(B^2) > 0# so #"tr"(A^2) +"tr"(B^2) >0#

so if #A^2+B^2=0->A=0,B=0#

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