问题如下：
  
Consider the following topologies on R:
1. T1 = the standard topology,
2. T2 = the topology of RK,
3. T3 = the finite complement topology,
4. T4 = the topology having all sets(-∞, a)={x I x<a} as basis.
  
Determine, for each of the topologies, which of the others it contains.
  
也可以点击下面原图更清楚：





谢谢！
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