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Nθ‐Ward Continuity

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Listed:
  • Huseyin Cakalli

Abstract

A function f is continuous if and only if f preserves convergent sequences; that is, (f(αn)) is a convergent sequence whenever (αn) is convergent. The concept of Nθ‐ward continuity is defined in the sense that a function f is Nθ‐ward continuous if it preserves Nθ‐quasi‐Cauchy sequences; that is, (f(αn)) is an Nθ‐quasi‐Cauchy sequence whenever (αn) is Nθ‐quasi‐Cauchy. A sequence (αk) of points in R, the set of real numbers, is Nθ‐quasi‐Cauchy if lim r→∞(1/hr)∑k∈Ir|Δαk|=0, where Δαk = αk+1 − αk, Ir = (kr−1, kr], and θ = (kr) is a lacunary sequence, that is, an increasing sequence of positive integers such that k0 = 0 and hr : kr − kr−1 → ∞. A new type compactness, namely, Nθ‐ward compactness, is also, defined and some new results related to this kind of compactness are obtained.

Suggested Citation

  • Huseyin Cakalli, 2012. "Nθ‐Ward Continuity," Abstract and Applied Analysis, John Wiley & Sons, vol. 2012(1).
  • Handle: RePEc:wly:jnlaaa:v:2012:y:2012:i:1:n:680456
    DOI: 10.1155/2012/680456
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    References listed on IDEAS

    as
    1. İbrahim Çanak & Mehmet Dik, 2010. "New Types of Continuities," Abstract and Applied Analysis, John Wiley & Sons, vol. 2010(1).
    2. Agata Caserta & Giuseppe Di Maio & Ljubiša D. R. Kočinac, 2011. "Statistical Convergence in Function Spaces," Abstract and Applied Analysis, Hindawi, vol. 2011, pages 1-11, December.
    3. Agata Caserta & Giuseppe Di Maio & Ljubiša D. R. Kočinac, 2011. "Statistical Convergence in Function Spaces," Abstract and Applied Analysis, John Wiley & Sons, vol. 2011(1).
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