Infinite or Finite: Examining Line Segments

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Discussion Overview

The discussion explores the nature of line segments in terms of their mathematical properties, specifically addressing whether a line segment is considered infinite or finite based on its points and length. The scope includes conceptual and mathematical reasoning related to set theory and geometry.

Discussion Character

  • Conceptual clarification
  • Mathematical reasoning

Main Points Raised

  • Some participants propose that a line segment, viewed as a set of its infinite points, should be considered infinite.
  • Others argue that while the set of points in a line segment is infinite, the geometrical length of the segment itself is finite.
  • A later reply clarifies that length is a specific measure on a set, which is distinct from the cardinality of the set, referring to the "size" of the set.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between the infinite nature of the points in a line segment and its finite length, indicating that the discussion remains unresolved.

Contextual Notes

Limitations include the dependence on definitions of length and cardinality, as well as the distinction between measure and set size, which are not fully explored in the discussion.

cam875
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If you were to describe a line segment as the set where all of its infinite points were individual elements within the set than wouldn't the overall set which is the line segment also be considered infinite and not finite.
 
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cam875 said:
If you were to describe a line segment as the set where all of its infinite points were individual elements within the set than wouldn't the overall set which is the line segment also be considered infinite and not finite.
Yes, as a set containing an "infinite" number of points, it is an infinite set. But that has nothing to do with its length if you were thinking of that as being finite.
 
so its geometrical length is still considered finite although its set is considered infinite?
 
cam875 said:
so its geometrical length is still considered finite although its set is considered infinite?

Length is a specific kind of measure on a set.

http://en.wikipedia.org/wiki/Measure_(mathematics )

This is distinct from the cardinality of the set. The cardinality of informally referred to as the "size" of the set.

http://en.wikipedia.org/wiki/Cardinality
 
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