Geodesic
UPPER AND LOWER FREQUENTLY UNIVERSAL SERIES
Glasgow mathematical journal, Tome 55 (2013) no. 3, pp. 615-627

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DOI

We introduce the notion of upper and lower frequently universal sequences and see that ‘most’ of the universal approximations are obtained by sets of indices which have upper density 1 and lower density 0. We also show that a class of universal series related to lower density is of first category.
DOI : 10.1017/S001708951200078X
Mots-clés : 30K05, 30E10 
PAPACHRISTODOULOS, CHRISTOS. UPPER AND LOWER FREQUENTLY UNIVERSAL SERIES. Glasgow mathematical journal, Tome 55 (2013) no. 3, pp. 615-627. doi: 10.1017/S001708951200078X
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     title = {UPPER {AND} {LOWER} {FREQUENTLY} {UNIVERSAL} {SERIES}},
     journal = {Glasgow mathematical journal},
     pages = {615--627},
     year = {2013},
     volume = {55},
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     doi = {10.1017/S001708951200078X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708951200078X/}
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