Abstract.
Let p be an odd prime. For any CM number field K containing a primitive pth-root of unity, class field theory and Kummer theory put together yield the well known reflection inequality λ+≤λ− between the “plus” and “minus” parts of the λ-invariant of K. Greenberg’s conjecture asserts that λ+ is always trivial. We study here a weak form of this conjecture, namely λ+=λ− if and only if λ+=λ−=0.
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Badino, R., Do, T. Sur les égalités du miroir et certaines formes faibles de la conjecture de Greenberg. manuscripta math. 116, 323–340 (2005). https://doi.org/10.1007/s00229-004-0531-4
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DOI: https://doi.org/10.1007/s00229-004-0531-4