first calculating the from (107) and (108a). We have
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(108b)
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With the help of these results, the field equations furnish Schwarzschild's solution:
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(109)
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in which we have put
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(109a)
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denotes the sun's mass, centrally symmetrically placed about the origin of co-ordinates; the solution (109) is valid only outside of this mass, where all the vanish. If the motion of the planet takes place in the plane then we must replace (109) by
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(109b)
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