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Conclusion
Abstract Krull-Webster’s theory offered an elegant extension of Bohr-Mollerup’s theorem and has proved to be a very nice and useful contribution to the resolution of the difference equation Δ f = g on the real half-line $$\mathbb {R}_+$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>ℝ</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msub> </mml:math> . …