
We investigate the interrelationships of three notions of primary units in the local cyclotomic field of $p$-th roots of~1($p$ being an odd prime number), especially with reference to global units.
7 pages, suppresed cor. 4 in v2, to appear in the Annales des sciences math\'ematiques du Qu\'ebec
Mathematics - Number Theory, FOS: Mathematics, Number Theory (math.NT), 11S10, 11R18, 11R27
Mathematics - Number Theory, FOS: Mathematics, Number Theory (math.NT), 11S10, 11R18, 11R27
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