What is the inherited topology of a line in RlxR and RlxRl?

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SUMMARY

The inherited topology of a line L in RlxR and RlxRl is determined by the intersections of open sets in R^2 with the line. In RlxR, the topology consists of unions of intervals [a,b)x(c,d), while in RlxRl, it follows the lower limit topology. The intersection of these open intervals with the line y=mx+b results in open intervals of the line, leading to the conclusion that the inherited topology is typically R. However, specific cases, such as the line y=-x in R_l x R, demonstrate that the inherited topology may differ from R depending on the intersection with the square [a,b)x(c,d).

PREREQUISITES
  • Understanding of RlxR and RlxRl topologies
  • Familiarity with open intervals in R^2
  • Knowledge of the lower limit topology
  • Basic concepts of subspace topology
NEXT STEPS
  • Study the properties of the lower limit topology in detail
  • Explore the concept of subspace topology in various contexts
  • Investigate intersections of lines with open sets in R^2
  • Learn about different types of topologies in mathematical analysis
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Mathematics students, particularly those studying topology, geometry, or analysis, will benefit from this discussion. It is also relevant for educators and researchers focusing on advanced mathematical concepts.

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Homework Statement


If L is a straight line in the plane, describe the topology L inherits
as a subspace of RlxR and as a subspace of RlxRl in each case it is a
familiar topology.(Rl= lower limit topology)



The Attempt at a Solution



RlxR topology is the union of intervals [a,b)x(c,d) which is any open interval in R^2. Likewise for the topology of RlxRl. Hence any intersection between open intervals in R^2 and the line y=mx+b will be an open interval of the line. So in both cases, won't the inherited topology just be R?
 
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It won't always be the inherited topology from R. For example in R_l x R, take the line y=-x (i.e. the set {(x,-x)}). What happens when you intersect it with the square [a,b)x(c,d)?
 

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