We define operations that give the set of all Pythagorean triples a structure of commutative monoid. In particular, we define these operations by using injections between integer triples and 3 × 3 matrices. Firstly, we completely characterize these injections that yield commutative monoids of integer triples. Secondly, we determine commutative monoids of Pythagorean triples characterizing some Pythagorean triple preserving matrices. Moreover, this study offers unexpectedly an original connection with groups over conics. Using this connection, we determine groups composed by Pythagorean triples with the studied operations.
@article{bwmeta1.element.doi-10_1515_math-2017-0111,
author = {Nadir Murru and Marco Abrate and Stefano Barbero and Umberto Cerruti},
title = {Groups and monoids of Pythagorean triples connected to conics},
journal = {Open Mathematics},
volume = {15},
year = {2017},
pages = {1323-1331},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_1515_math-2017-0111}
}
Nadir Murru; Marco Abrate; Stefano Barbero; Umberto Cerruti. Groups and monoids of Pythagorean triples connected to conics. Open Mathematics, Tome 15 (2017) pp. 1323-1331. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_1515_math-2017-0111/