'Nobody could possibly misunderstand what a group is': a study in early twentieth-century group axiomatics

In the early years of the twentieth century, the so-called 'postulate analysis'-the study of systems of axioms for mathematical objects for their own sake-was regarded by some as a vital part of the efforts to understand those objects. I consider the place of postulate analysis within early twentieth-century mathematics by focusing on the example of a group: I outline the axiomatic studies to which groups were subjected at this time and consider the changing attitudes towards such investigations.