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Within the framework of the general theory of relativity, it is proposed to introduce at each point of space-time a Euclidean metric tensor γ_μν in addition to the usual Riemannian metric tensor g_μν. In this way one imparts tensor character to quantities which in the usual form of the theory do not have it. For example, one can obtain a gravitational energy-momentum density tensor in place of the usual pseudo-tensor. Furthermore one can impose four additional covariant conditions on the gravitational field and thus restrict the form of the solution for the field corresponding to a given physical situation.
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N. Rosen (1940) studied this question.
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