Talk:Integer triangle

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45 degrees?
Are there any integer triangles where the angle of the long leg is 45 degrees? Thanks. SharkD  Talk  01:11, 16 January 2018 (UTC)


 * Assuming you mean the angle opposite the longest leg, the answer is no. The angle opposite the longest leg is the greatest angle, and if 45° was the largest angle, then the total of all the angles would be less than 45°+45°+45°, which is less than the required 180°. Loraof (talk) 22:22, 3 February 2018 (UTC)


 * Irrespective of where the 45 degree angle occurs in a triangle, the answer is always no. By the law of cosines, every angle of an integer triangle has a rational cosine and the cosine of 45 degrees is irrational. See beginning of article. Frank M. Jackson (talk) 08:23, 4 February 2018 (UTC)

Suggesting removal of 2 paragraphs
Is there any objection to my removing the second and third paragraphs of the section Integer triangle (and starting the next paragraph with “However” instead of “Furthermore”)? I don’t see what they add. Loraof (talk) 18:16, 14 February 2018 (UTC)


 * I agree with the removal. The second and third paragraphs follow clearly from the first, and so are redundant.—Anita5192 (talk) 18:52, 14 February 2018 (UTC)


 * Done. Loraof (talk) 22:29, 15 February 2018 (UTC)

Suggesting moving material to main article
Is there any objection to my moving the entire section Integer triangle from here to the article and section Heronian triangle? “Heronian triangle” is the main article, so I think that material at this level of detail belongs there. Right now the properties are split between the two articles, with each linking to the others for more information. Loraof (talk) 18:23, 14 February 2018 (UTC)


 * Done. Loraof (talk) 16:59, 16 February 2018 (UTC)

particular integer triangles: Hirakawa–Matsumura theorem
The Hirakawa–Matsumura theorem was used as a motivating example by Professor Jennifer S. Balakrishnan in a lecture on "COMPUTATIONAL TOOLS FOR QUADRATIC CHABAUTY" at the 2020 Arizona Winter School. The subjects of the winter school are on the roadmap for understanding perfectoid spaces, so says mathoverflow: https://mathoverflow.net/questions/260330/a-roadmap-for-understanding-perfectoid-spaces. http://swc.math.arizona.edu/     is the website of the winter school, an these are professor Balakrishnans lecture notes: http://math.bu.edu/people/jbala/2020BalakrishnanMuellerNotes.pdf Putting together, this line of observations can possibly raise the importance of the subject.--Himbeerbläuling (talk) 22:57, 21 July 2020 (UTC) In one minor point of my talk above i was wrong: the perfectoid winter school was in 2017, Professor Balakrishnans lecture was in 2020. I was misled by the link from mathoverflow, which points to "this year winter school" whatever "this" may mean. But the Chabauty theory is also important.--Himbeerbläuling (talk) 13:49, 22 July 2020 (UTC)