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A comment on Beware of Cranks: Misguided attempts to solve impossible mathematical problems. Parent comment

Re:Beware of Cranks: Misguided attempts to solve impossible ... by throwaway2048 on Wednesday October 09, 2019 @06:05PM (#21208674)
An important aspect of this isn't that you cant trisect any particular angle, its that you cant trisect any arbitrary angle, plenty of angles, like 90 degrees, are trivial to trisect.
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Re:Beware of Cranks: Misguided attempts to solve impossible ... by xyzzyz on Wednesday October 09, 2019 @06:41PM (#21208972)
Yes. The better way to phrase it would be that some angles are impossible to construct, and importantly that includes a trisection of some angles that can in fact be constructed.
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Re:Beware of Cranks: Misguided attempts to solve impossible ... by secraetomani on Wednesday October 09, 2019 @07:13PM (#21209226)
Interesting. So like you have rational numbers and irrational numbers, you have trisectable angles and non-trisectable ones.
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Re:Beware of Cranks: Misguided attempts to solve impossible ... by schoen on Thursday October 10, 2019 @01:46PM (#21217309)
This analogy is rather precise—see this comment elsewhere in this thread.

https://news.ycombinator.com/item?id=21209466

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