Vol. 7 No. 2 (2019)

Articles

• Ranks and sets evincing them for the tangent developable

  Edoardo Ballico

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• Counting negative eigenvalues of one-dimensional Schrodinger operators with singular potentials

  Martin Karuhanga, Shargorodsky Eugene

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• Sums where fractional parts appear

  Rafael Jakimczuk

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• On symmetric bi-derivations and commutativity of prime rings

  Kyung Ho Kim

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• When every finitely presented proper ideal is regular

  Jawad Squalli

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• Rigged null hypersurfaces in almost paracontact metric manifolds

  F. Ngakeu, A.C. Djomako, Bitjong Ndombol

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• On the numerical range of some nonlinear operators in l_p Spaces

  Fehim Dedagic

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• Derivations and dimensionally nilpotent derivations in Lie triple algebras

  Abdoulaye Dembega, Amidou Konkobo, Moussa Ouattara

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