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An elementary derivation of the fundamental relation $T/S=4\gamma$ betweenthe tensor and scalar modes of cosmological perturbations in the early universeis given. Statements by L.P.Grishchuk on this problem are commented on.Comment: An extended version of the paper published in Usp. Fiz. Nauk 176, 113  (2006) [Phys. Usp. V.49, P.103 (2006)]; 8 page

On the relation between tensor and scalar perturbation modes in Friedmann cosmology