**Ranks and sets evincing them for the tangent developable**

Eduardo Ballico

Gulf J. Math. pp. 1-4

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

Martin Karuhanga and Eugene Shargorodsky

Gulf J. Math. pp. 5-15

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**Sums where fractional parts appear**

Rafael Jakimczuk

Gulf J. Math. pp. 16-21

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**On symmetric bi-derivations and commutativity of prime rings**

Kyung Ho Kim

Gulf J. Math. pp. 22-30

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**When every finitely presented proper ideal is regular**

Jawad Squalli

Gulf J. Math. pp. 31-36

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**Rigged null hypersurfaces in almost paracontact metric manifolds**

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

Gulf J. Math. pp. 37-56

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**On the numerical range of some nonlinear operators in l _{p} spaces**

Fehim Dedagic

Gulf J. Math. pp. 57-70

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**Derivations and dimensionally nilpotent derivations in Lie triple algebras**

Abdoulaye Dembega, Amidou Konkobo and Moussa Ouattara

Gulf J. Math. pp. 71-84

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