Geodesic
$\alpha $-ideals in $0$-distributive posets
Mathematica Bohemica, Tome 140 (2015) no. 3, pp. 319-328

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The concept of $\alpha $-ideals in posets is introduced. Several properties of $\alpha $-ideals in $0$-distributive posets are studied. Characterization of prime ideals to be $\alpha $-ideals in $0$-distributive posets is obtained in terms of minimality of ideals. Further, it is proved that if a prime ideal $I$ of a $0$-distributive poset is non-dense, then $I$ is an $\alpha $-ideal. Moreover, it is shown that the set of all $\alpha $-ideals $\alpha \mathop {\rm Id}(P)$ of a poset $P$ with $0$ forms a complete lattice. A result analogous to separation theorem for finite $0$-distributive posets is obtained with respect to prime $\alpha $-ideals. Some counterexamples are also given.
The concept of $\alpha $-ideals in posets is introduced. Several properties of $\alpha $-ideals in $0$-distributive posets are studied. Characterization of prime ideals to be $\alpha $-ideals in $0$-distributive posets is obtained in terms of minimality of ideals. Further, it is proved that if a prime ideal $I$ of a $0$-distributive poset is non-dense, then $I$ is an $\alpha $-ideal. Moreover, it is shown that the set of all $\alpha $-ideals $\alpha \mathop {\rm Id}(P)$ of a poset $P$ with $0$ forms a complete lattice. A result analogous to separation theorem for finite $0$-distributive posets is obtained with respect to prime $\alpha $-ideals. Some counterexamples are also given.
DOI : 10.21136/MB.2015.144398
Classification : 06A06, 06A75
Keywords: $0$-distributive poset; ideal; $\alpha $-ideal; prime ideal; non-dense ideal; minimal ideal; annihilator ideal 
Mokbel, Khalid A. $\alpha $-ideals in $0$-distributive posets. Mathematica Bohemica, Tome 140 (2015) no. 3, pp. 319-328. doi: 10.21136/MB.2015.144398
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