초록

We define an octahedron set and introduce the notions of internal octahedron sets and external octahedron sets and study some related properties and give some examples. Also, we define Type $i$-order, Type $i$-intersection, Type $i$-union ($i=1,~2,~3,~4$) and study some of their properties. Moreover, we define an octahedron point and deal with the characterizations of Type $i$-union (Type $i$-intersection). Also, we introduce the level set of an octahedron set and obtain one property. Finally, we define the image and preimage of an octahedron set under a mapping and investigate some of their properties.

키워드

Octahedron set, Internal (external) octahedron set, $i$-union, $i$-intersection, Octahedron point, Level set, Image and preimage of octahedron set

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