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A comment on Should proofs include a third “context” column?.

Re:Should proofs include a third “context” column? by qsort on Wednesday January 12, 2022 @03:22PM (#29912233)
Is this ``two-column'' proof style an American thing?

I'm not a mathematician but I've written my fair share of proofs (incl. math competitions) and I don't ever recall being taught or having used something like this.

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Re:Should proofs include a third “context” column? by jacksnipe on Wednesday January 12, 2022 @03:33PM (#29912348)
In the US, it is typically a large part of the High School Geometry curriculum. This is exacerbated by Euclid’s Elements being a required part of the syllabus in many states (I’m familiar with southern ones, but I’m sure there are more).
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