<Table> <Tr> <Td>... (repeats the pattern from blue area) </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> <Tr> <Td> i = − 1 </Td> </Tr> <Tr> <Td> i = − i </Td> </Tr> <Tr> <Td> i = 1 </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> <Tr> <Td> i = − 1 </Td> </Tr> <Tr> <Td> i = − i </Td> </Tr> <Tr> <Td> i = 1 </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> <Tr> <Td> i = − 1 </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> </Table> <Tr> <Td>... (repeats the pattern from blue area) </Td> </Tr> <Tr> <Td> i = i </Td> </Tr> <Tr> <Td> i = − 1 </Td> </Tr>

Who created the imaginary symbol and when did he created the name