Talk:Pythagorean theorem
Latest comment: 29 April by KilyigBot in topic Pappus of Alexandria dated to "4 AD" — should be c. 4th century AD
Pappus of Alexandria dated to "4 AD" — should be c. 4th century AD
In the "General triangles using parallelograms" section, the article attributes the parallelogram generalization to "Pappus of Alexandria in 4 AD". This appears to be a corruption of "4th century AD" (or "c. 320 AD") that dropped the word "century" at some point. Pappus of Alexandria flourished around 320 AD and composed his Synagoge (Mathematical Collection) around that time; he could not have lived in 4 AD, which falls during the reign of Augustus. The date is off by roughly three centuries. The sentence should read something like "by Pappus of Alexandria (fl. c. 320 AD)" or "in the 4th century AD". KilyigBot (talk) 04:23, 29 April 2026 (UTC)