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| author | bnewbold <bnewbold@eta.mit.edu> | 2008-11-05 02:30:02 -0500 | 
|---|---|---|
| committer | bnewbold <bnewbold@eta.mit.edu> | 2008-11-05 02:30:02 -0500 | 
| commit | 7fb2bedfc29bb6a52520f280ce73b7491e071740 (patch) | |
| tree | c8f5d0cf823f5ba7383c21c84e2a72b5ddedf12a /math/topology | |
| parent | 0b113afaa8ae15d3672c6c50f6f6b5b26d78d618 (diff) | |
| download | knowledge-7fb2bedfc29bb6a52520f280ce73b7491e071740.tar.gz knowledge-7fb2bedfc29bb6a52520f280ce73b7491e071740.zip  | |
better for now
Diffstat (limited to 'math/topology')
| -rw-r--r-- | math/topology | 14 | 
1 files changed, 8 insertions, 6 deletions
diff --git a/math/topology b/math/topology index 79beeae..6f03eee 100644 --- a/math/topology +++ b/math/topology @@ -2,7 +2,7 @@  Topology  ==================== -.. note:: Incomplete; in progress +.. warning:: Incomplete; in progress  .. note:: Most of the definitions and notation in the section are based on [munkres]_  @@ -14,7 +14,7 @@ concept of open and closed subsets on the real number line (such as :m:`$(0,1)$`  Formally, a *topology* on a set :m:`$A$` is a collection :m:`$\mathcal{T}$` of   subsets of :m:`$A$` fufiling the criteria: - 1. The empty set and the entire set :m:`$A$`:m: are both in :m:`$\mathcal{T}$`. + 1. The empty set and the entire set :m:`$A$` are both in :m:`$\mathcal{T}$`.   2. The union of an arbitrary number of elements of :m:`$\mathcal{T}$` is       also in :m:`$\mathcal{T}$`. @@ -34,6 +34,7 @@ or :m:`$\mathcal{T'\in T}$`.  *Smaller* and *larger* are somtimes used instead of finer and coarser.  Topologies can be generated from a *basis*.  +  TODO: Hausdorf  Frequently Used Topologies @@ -42,6 +43,7 @@ Frequently Used Topologies  *Standard Topology*      The standard topology on the real line is generated by the collection of all intervals       :m:`$$(a,b)=\{x|a<x<b\}$$` +      This is the usual definition for open sets on the real line.  *Discrete Topology* @@ -52,15 +54,15 @@ Frequently Used Topologies      The topology on a set :m:`$A$` consisting of only the empty set and :m:`$A$`      itself. Not super interesting but it's always there (when :m:`$A$` isn't empty). -*Finite Complement Topology* (:m:`$\mathcal{T_f}$`) +*Finite Complement Topology* (:m:`$\mathcal{T}_f$`)      The topology on a set :m:`$A$` consisting of the empty set any subset       :m:`$U$` such that :m:`$A-U$` has a finite number of elements. -*Lower Limit Topology* (:m:`$\mathbb{R}_\mathcal{l}$`) +*Lower Limit Topology* (:m:`$\mathbb{R}_{\mathcal{l}}$`)      The lower limit topology on the real line is generated by the collection of all half open      intervals      :m:`$$[a,b)=\{x|a\leq x<b\}$$` -    :m:`$\mathbb{R}_\mathcal{l}$` is strictly finer than the standard topology and +    :m:`$\mathbb{R}_{\mathcal{l}}$` is strictly finer than the standard topology and      is not comprable to :m:`$\mathbb{R}_K$`.  *K-Topology* (:m:`$\mathbb{R}_K$`) @@ -69,7 +71,7 @@ Frequently Used Topologies      The K-topology on the real line is generated by the collection of all standard open intervals       minus :m:`$K$`.       :m:`$\mathbb{R}_K$` is strictly finer than the standard topology and is not -    comprable to :m:`$\mathbb{R}_\mathcal{l}$`. +    comprable to :m:`$\mathbb{R}_{\mathcal{l}}$`.  *Order Topology*      TODO  | 
