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Zwiebach page 182
Zwiebach says equation 10.107 means h_II is traceless when p^2 equals 0. But it seems to me like p^2 = 0 would mean that every element in the diagonal would need be zero as opposed to only their sum? There is no implied summation in 10.107 is there?
Homework Statement
Zwiebach says equation 10.107 means h_II is traceless when p^2 equals 0. But it seems to me like p^2 = 0 would mean that every element in the diagonal would need be zero as opposed to only their sum? There is no implied summation in 10.107 is there?
Homework Equations
The Attempt at a Solution
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