Signature of quadratic form and eigenvalues

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I'm asking about the signature of the quadratic form - the triple (n0, n+, n−). Is it true that n+ is the number of positive eigenvalues, and n- is the number of negative of eigenvalues of the matrix that represent the quadratic form?

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Indeed n+ is the number of positive eigenvalues, and n- is the number of negative of eigenvalues of the matrix that represent the quadratic form, thanks for the comment that navigated me.