Upper central series and lower central series has the same length but the factors may not be equal as an example consider lower central series and upper central series of G=1nZZ01Z001

where n is a fixed integer

series hos Exerise Upper centre series and lover central the same length but the factors may not be equal as an example Conspeler lower central series and upper central series of 1 nz z 2 G- Z a is a fixed integer. 0 series hos Exerise Upper centre series and lover central the same length but the factors may not be equal as an example Conspeler lower central series and upper central series of 1 nz z 2 G- Z a is a fixed integer. 0