Comment on xkcd #3077: de Sitter

idiomaddict@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

• Bumblefumble@lemm.ee ⁨2⁩ ⁨weeks⁩ ago

  Try drawing a triangle on a globe and measure the angles, it will be more than 180 degrees. That’s probably the simplest visualisation possible.

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  • idiomaddict@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

    Look at you, making it all easy to understand

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    • knightly@pawb.social ⁨2⁩ ⁨weeks⁩ ago

      Spheres are examples of surfaces with positive curvature. Negative curvature (where the angles of a triangle add up to less than 180 degrees) is represented by this saddle shape:

      Image

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      • Hamartiogonic@sopuli.xyz ⁨2⁩ ⁨weeks⁩ ago

        If you draw a triangle on different parts of a toroid, would you get different angles?

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