R Rx

*Vv = ^ iXv, which is known as the 'Ricci tensor', and we can also make use of

R = siv Riv, which is the curvature scalar.

The crucial property of the curvature tensor for our discussion here is that if we are in the situation of special relativity, where the metric tensor is niv, then Rx1Kv = Riv = R = 0. On 11 November, Einstein proposed that the field equations of general relativity are

Riv = K Tiv, where k is a constant, though he knew that this could be true only if an additional hypothesis about the electromagnetic nature of matter was made. This then reduces to

0 0

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