<Tr> <Th_colspan="2"> Georg Simmel </Th> </Tr> <Tr> <Td_colspan="2"> Georg Simmel </Td> </Tr> <Tr> <Th> </Th> <Td> 1 March 1858 Berlin, Kingdom of Prussia </Td> </Tr> <Tr> <Th> </Th> <Td> 28 September 1918 (1918 - 09 - 28) (aged 60) Strassburg, German Empire </Td> </Tr>

Discuss some of the central ideas of simmel in sociology in 500 words