Is the following statement correct for isotropic random fields 'Their covariance functions are non negative' Question 3Select one True False

Question

Is the following statement correct for isotropic random fields  'Their covariance functions are non negative'  Question 3Select one  True False

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Question: Is the following statement correct for isotropic random fields: 'Their covariance functions are non-negative'? Question 3Select one: True False