Timeline for How can I (semi-formally) convince myself that Euclidean geometry comports with visual intuition?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Mar 21 at 10:59 | comment | added | printf | If you're referring to the two metallic things, they don't look parallel to me, at all. In fact, from this photograph alone, I don't know their geometry at all. Maybe they are two straight, tapering metallic sticks that have been arranged vertically so that they make an angle of around $30^\circ$–$40^\circ$. (Hopefully those who have been born on this planet can explain to me the meaning of these metallic objects, and why they are supposed to be parallel, but since I'm not from here, nothing directly tells me anything about Euclidean space from this picture.) | |
| Mar 20 at 20:42 | comment | added | LSpice | Well, they don't look to me like they cross …. I don't mean that completely facetiously: I'm OK with adding an ideal point at infinity where the lines meet, but nothing in this picture suggests to me continuing the lines past that point at infinity. | |
| Mar 20 at 17:25 | vote | accept | M. Sperling | ||
| Mar 20 at 17:24 | comment | added | Francois Ziegler | Related (from 1947): mathoverflow.net/questions/178021/… | |
| Mar 20 at 10:26 | history | answered | Carlo Beenakker | CC BY-SA 4.0 |