Ideal-Aura Topological Spaces, New Local Functions, and Generalized Open Sets
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| Format: | Preprint |
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2026
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| _version_ | 1866917277525344256 |
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| author | Acikgoz, Ahu Ozkoc, Murad |
| author_facet | Acikgoz, Ahu Ozkoc, Murad |
| contents | We combine an ideal topological space $(X, τ, \mathcal{I})$ with a scope function $\mathfrak{a}: X \to τ$, $x \in \mathfrak{a}(x)$, to form what we call an ideal-aura topological space $(X, τ, \mathcal{I}, \mathfrak{a})$. The central new object is the aura-local function $A^{\mathfrak{a}}(\mathcal{I}) = \{x \in X : \mathfrak{a}(x) \cap A \notin \mathcal{I}\}$, which extends the Jankovic-Hamlett local function: we always have $A^{*}(\mathcal{I}, τ) \subseteq A^{\mathfrak{a}}(\mathcal{I})$. The closure $\operatorname{cl}^{*}_{\mathfrak{a}}(A) = A \cup A^{\mathfrak{a}}(\mathcal{I})$ is an additive Cech closure operator that, in general, fails to be idempotent; we prove that idempotency is equivalent to transitivity of $\mathfrak{a}$. The resulting Cech topology $τ^{*}_{\mathfrak{a}}$ sits in the chain $τ_{\mathfrak{a}} \subseteq τ^{*}_{\mathfrak{a}} \subseteq τ^{*}$, interpolating between the pure aura topology and the classical ideal topology. We introduce a $ψ_{\mathfrak{a}}$-operator and use it to give an alternative description of $τ^{*}_{\mathfrak{a}}$. Five classes of $\mathcal{I}\mathfrak{a}$-generalized open sets are defined and arranged in a hierarchy, with strict inclusions separated by counterexamples. Decomposition theorems for $\mathcal{I}\mathfrak{a}$-continuity are proved. Three special cases are examined: the trivial ideal recovers the pure aura topology, the improper ideal gives the discrete topology, and the ideal of finite sets exhibits a localization phenomenon. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_07692 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ideal-Aura Topological Spaces, New Local Functions, and Generalized Open Sets Acikgoz, Ahu Ozkoc, Murad General Topology 54A05, 54A10, 54C08, 54E99 We combine an ideal topological space $(X, τ, \mathcal{I})$ with a scope function $\mathfrak{a}: X \to τ$, $x \in \mathfrak{a}(x)$, to form what we call an ideal-aura topological space $(X, τ, \mathcal{I}, \mathfrak{a})$. The central new object is the aura-local function $A^{\mathfrak{a}}(\mathcal{I}) = \{x \in X : \mathfrak{a}(x) \cap A \notin \mathcal{I}\}$, which extends the Jankovic-Hamlett local function: we always have $A^{*}(\mathcal{I}, τ) \subseteq A^{\mathfrak{a}}(\mathcal{I})$. The closure $\operatorname{cl}^{*}_{\mathfrak{a}}(A) = A \cup A^{\mathfrak{a}}(\mathcal{I})$ is an additive Cech closure operator that, in general, fails to be idempotent; we prove that idempotency is equivalent to transitivity of $\mathfrak{a}$. The resulting Cech topology $τ^{*}_{\mathfrak{a}}$ sits in the chain $τ_{\mathfrak{a}} \subseteq τ^{*}_{\mathfrak{a}} \subseteq τ^{*}$, interpolating between the pure aura topology and the classical ideal topology. We introduce a $ψ_{\mathfrak{a}}$-operator and use it to give an alternative description of $τ^{*}_{\mathfrak{a}}$. Five classes of $\mathcal{I}\mathfrak{a}$-generalized open sets are defined and arranged in a hierarchy, with strict inclusions separated by counterexamples. Decomposition theorems for $\mathcal{I}\mathfrak{a}$-continuity are proved. Three special cases are examined: the trivial ideal recovers the pure aura topology, the improper ideal gives the discrete topology, and the ideal of finite sets exhibits a localization phenomenon. |
| title | Ideal-Aura Topological Spaces, New Local Functions, and Generalized Open Sets |
| topic | General Topology 54A05, 54A10, 54C08, 54E99 |
| url | https://arxiv.org/abs/2602.07692 |