How is a straight line/straight curve defined (in contexts where it is meaningful) ?(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to wrap my mind around this concept, but I can't understand it at all : how is straight-ness defined? is it defined ? or should I take it as an axiom, or just think about it at an intuitive level and say "a straight line is something that looks like this _____________" ?

To clear things up a bit : is there a concrete synthetic definition of straightness that precisely describes something which looks like this ____ (beyond the circular attempts of algebraic/analytic geometry) ?

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Definition of *straight* lines

Loading...

Similar Threads - Definition *straight* lines | Date |
---|---|

I Basic Q about Vector/tensor definition and velocity | Feb 24, 2018 |

B What is a straight line? | Nov 4, 2017 |

I Definition of tangent space: why germs? | Oct 2, 2017 |

A Intution behind the definition of extrinsic curvature | Jun 15, 2017 |

A Definition of the Lie derivative | Oct 27, 2016 |

**Physics Forums - The Fusion of Science and Community**