Quantum ricochets: surface capture, release and energy loss of fast ions hitting a polar surface a Video abstract for the article ‘Quantum ricochets: surface capture, release and energy loss of fast ions hitting a polar surface at grazing incidence‘ by A A Lucas, M Sunjic , G Benedek and P M Echeni... On certain properties of harmonic numbers On certain properties of harmonic numbers. Let Hn be the n -th harmonic number and let un be its numerator. For any prime p , let Jp be the set of positive integers n with p|un. In 1991, Eswaratha... Created and maintained by Ryan Watkins (2013-present)
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