例句與造句

1. ;paracompact if every open cover has a locally finite open refinement.
2. Now replace \ mathcal { V } \, by a locally finite open refinement.
3. A topological space " X " is said to be of covering dimension " n " if every open cover of " X " has a point finite open refinement such that no point of " X " is included in more than " n " + 1 sets in the refinement and if " n " is the minimum value for which this is true.
4. There is also finite-dimensional generalization to a larger class of spaces : If X is a product of finitely many chainable continua, then every continuous function f : X \ rightarrow X has a fixed point, where a chainable continuum is a ( usually but in this case not necessarily compact Hausdorff space of which every open cover has a finite open refinement \ { U _ 1, \ ldots, U _ m \ }, such that U _ i \ cap U _ j \ neq \ emptyset if and only if | i-j | \ leq 1.
5. It's difficult to find finite open refinement in a sentence. 用finite open refinement造句挺難的