Topology Proceedings 15 (1990) pp. 185-198: A COMPARISON OF TWO CONSTRUCTIONS IN TOPOLOGY
نویسندگان
چکیده
We compare two constructions of families of sequentially compact Ilausdorff spaces whose product is not countably compact, and show that every space that can be constructed by one construction is homeomorphic to a subspace of some space constructed by the other construction, but not vice versa.
منابع مشابه
Topology Proceedings 15 (1990) pp. 135-141: THE PARACOMPACTNESS OF SPACES RELATED TO UNCOUNTABLE BOX PRODUCTS
Let X be a box product of K many compact metric spaces. We give various models in which X/finite and X/countable are paracompact, as well as related re sults.
متن کاملA New Topology for Dynamic Voltage Restorer Using High Frequency Link
In this paper a new topology for Dynamic Voltage Restorer (DVR) with high frequency link is proposed. This topology is able to compensate different types of voltage disturbances such as voltage sag, voltage swell and voltage harmonics. According to the obtained equations, this topology operates as a controllable current source to charge the series capacitor. Due to using High Frequency Transfor...
متن کاملEFFICIENT SIMULATION FOR OPTIMIZATION OF TOPOLOGY, SHAPE AND SIZE OF MODULAR TRUSS STRUCTURES
The prevalent strategy in the topology optimization phase is to select a subset of members existing in an excessively connected truss, called Ground Structure, such that the overall weight or cost is minimized. Although finding a good topology significantly reduces the overall cost, excessive growth of the size of topology space combined with existence of varied types of design variables challe...
متن کاملA New Topology for Interline Dynamic Voltage Restorer Based on Direct Three-Phase Converter
In this paper, a new topology for Interline Dynamic Voltage Restorer (IDVR) is proposed. This topology contains two direct three-phase converters which have been connected together by a common fictitious dc-link. According to the kind of the disturbances, both of the converters can be employed as a rectifier or inverter. The converters receive the required compensation energy from the gird thro...
متن کاملReduction the Number of Power Electronic Devices of a Cascaded Multilevel Inverter Based on New General Topology
In this paper, a new cascaded multilevel inverter by capability of increasing the number of output voltage levels with reduced number of power switches is proposed. The proposed topology consists of series connection of a number of proposed basic multilevel units. In order to generate all voltage levels at the output, five different algorithms are proposed to determine the magnitude of DC volta...
متن کامل