Concentric circles are parallel?

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Discussion Overview

The discussion centers on the concept of parallelism in relation to concentric circles, exploring definitions of parallel lines and whether curves can be considered parallel. Participants engage in a debate over the applicability of traditional definitions of parallelism from Euclidean geometry to curved shapes, including concentric circles.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants argue that concentric circles can be considered parallel under certain definitions, while others assert that traditional definitions of parallelism apply only to straight lines.
  • A participant suggests that the definition of parallel lines does not require them to be straight, proposing that curves can also be parallel if they maintain a constant distance apart.
  • Another participant challenges the idea that non-intersecting curves are necessarily parallel, emphasizing that two curves can be non-intersecting without being parallel.
  • Some contributions mention the distinction between Euclidean and non-Euclidean geometries, suggesting that the understanding of parallelism may differ in these contexts.
  • There is a discussion about the nature of definitions and the limitations of human understanding regarding parallelism, particularly in relation to non-Euclidean geometries.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether concentric circles can be considered parallel. Multiple competing views remain regarding the definitions of parallelism and the applicability of these definitions to curves.

Contextual Notes

Participants highlight the ambiguity in the definition of parallelism, noting that different contexts (Euclidean vs. non-Euclidean geometry) may lead to different interpretations. There is also mention of the limitations in understanding parallelism as it relates to curves versus straight lines.

  • #211
To add concentric circles to our definition of "parallel lines," you would have to prove all the rules for parallel lines apply. One of those rules has to do with parallel lines intersecting other parallel lines (corresponding angles are equal). Can you show me even one that works? (ALL should work if what you say should be accepted.)
 

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  • #212
AC130Nav said:
To add concentric circles to our definition of "parallel lines," you would have to prove all the rules for parallel lines apply. One of those rules has to do with parallel lines intersecting other parallel lines (corresponding angles are equal). Can you show me even one that works? (ALL should work if what you say should be accepted.)

The straight line parallel has the phase angle to be equal, generally, the curve parallel does not have the corresponding angle to be equal.
 

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