<Tr> <Td> <Ul> <Li> Kaluza--Klein theory </Li> <Li> Quantum gravity </Li> <Li> Supergravity </Li> </Ul> </Td> </Tr> <Ul> <Li> Kaluza--Klein theory </Li> <Li> Quantum gravity </Li> <Li> Supergravity </Li> </Ul> <Li> Kaluza--Klein theory </Li> <Tr> <Td> Solutions (show) <Ul> <Li> Schwarzschild (interior) </Li> <Li> Reissner--Nordström </Li> <Li> Gödel </Li> <Li> Kerr </Li> <Li> Kerr--Newman </Li> <Li> Kasner </Li> <Li> Lemaître--Tolman </Li> <Li> Taub - NUT </Li> <Li> Milne </Li> <Li> Robertson--Walker </Li> <Li> pp - wave </Li> <Li> van Stockum dust </Li> <Li> Weyl − Lewis − Papapetrou </Li> <Li> Vacuum solution (general relativity) </Li> <Li> Vacuum solution </Li> </Ul> </Td> </Tr>

What is the improvement included in the general theory of relativity