This paper demonstrates what boundary axioms are and the condition under which boundary axioms equal the axioms of open sets.

首先给出边界公理的定义，然后证明边界公理与开集公理的条件等价。

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We introduce the concepts of semi-open sets and semi-continuous functions, and discuss some of their properties in fuzzifying topology.

给出了不分明化拓扑空间中半开集和半连续函数的概念，并讨论了它们的某些性质。

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They are catalogued on OpenEI.org, which along with energy.data.gov showcases a wide range of open energy data sets.

WHITEHOUSE: Brainstorming With Energy Data

Since Andy Murray 's first loss to Juan Ignacio Chela in 2006 Aus Open, 15 sets to 1 and three straight on clay for Murray.

BBC: French Open day 11 as it happened

The film begins shakily, but when Broderick steps up for his first big number the sets open up, some tap-dancing beauties are brought out, and the film begins to fly.

NEWYORKER: The Producers