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Cake day: June 2nd, 2023

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  • Urist@lemmy.mltoAsklemmy@lemmy.ml*Permanently Deleted*
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    5 months ago

    It is still not civil war, it is just plain old fascism. The politicians that endorse “vigilantes” to uphold “democracy”, “freedom” or whatever bullshit they can make up, are just exerting regular political violence from the old fascist playbook.

    Making you feel scared is the point.






  • Urist@lemmy.mltoProgrammer Humor@lemmy.mlComenting code
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    5 months ago

    The only problem with courses like calc 3 and differential equations (in my experience, as a mathematician) is that they are cheating somewhat. By cheating I mean relying on inadequate, flawed or entirely omitted proofs. How can the students truly understand something if they are not presented the whole story (or at least reference)?

    The good thing about these courses are that there are usually no shortage of relevant exercises!



  • Urist@lemmy.mltoNo Stupid Questions@lemmy.worldIs this a triangle?
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    6 months ago

    It is a triangle. The abstraction of lines in non-Euclidean geometry are geodesics and just like three lines form a triangle, so do the geodesics. If you walked along the earth’s surface from the equator to the North Pole and back, taking 90 degrees angles every time, you will have felt that you made a triangle by walking straight in three directions.

    The reason the angle sum can be more than 180 degrees is that the sphere has a positive curvature. If you want one with negative curvature and less than 180 degrees angle sum, try to make one on the side of the hole on a torus (look up its curvature if my explanation was lacking).

    EDIT: Picture for reference: