Volume 19, No. 2.

Table of contents

1. Computing semi-commuting differential operators in one and multiple variables

   Robert A. Van Gorder

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2. On an inequality of I. Perić

   Sadia Khalid, Josip Pečarić, Marjan Praljak

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3. Computing coarse shape groups of solenoids

   Nikola Koceić Bilan

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4. Perfect Mannheim, Lipschitz and Hurwitz weight codes

   Murat Güzeltepe, Olof Heden

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5. Isoptic curves of conic sections in constant curvature geometries

   Géza Csima, Szirmai Jenő

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6. Biharmonic curves in ${\widetilde{SL(2,R)}}$ space

   Zlatko Erjavec, Damir Horvat

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7. Willmore spacelike submanifolds in a Lorentzian space form $N^{n+p}_p(c)$

   Shichang Shu, Junfeng Chen

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8. k-generalized Fibonacci numbers of the form 1+2^{n_1}+4^{n_2}+\cdots+(2^{k})^{n_k}

   Carlos Alexis Gómez Ruiz, Florian Luca

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9. Golden maps between Golden Riemannian manifolds and constancy of certain maps

   Bayram Şahin, Mehmet Akif Akyol

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10. Classification of complete left-invariant affine structures on the oscillator group

    Mohammed Guediri

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11. A characterization of linear operators that preserve isolation numbers

    LeRoy B. Beasley, Song Seok-Zun

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12. Generalized extrapolation methods for solving nonlinear Fredholm integral equations

    Javad Farzi

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13. On an extension of the Stone–Weierstrass theorem

    Kuppum V. Srikanth, Raj Bhawan Yadav

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14. Application of potential method to survey analysis

    Lavoslav Čaklović, Sonja Radas

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15. An efficient hybrid pseudo-spectral method for solving optimal control of Volterra integral systems

    Khosrow Maleknejad, Asyieh Ebrahimzadeh

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