I'm not sure if this question should be posted on overflow. So I put it here first.
I see the abbreviation of the journal Annals of mathematics is always like Ann. of Math. (2). I'm confused why it always comes with "(2)". It probably means "second series". But I never see the first series.
Can someone explain the history or the method of indexing for the annals?
An answer, for the record: the first series of the Annals of Mathematics ran until 1898 volume 12. It then restarted as the second series with 1899 volume 1. You can find the volumes of the first series at JSTOR. The switch from first to second series coincided with the move of the journal home from the University of Virginia to Harvard. It then moved to its current home in Princeton in 1911, without starting a new series.