you have Euclidean geometry and you can also become non-Euclidean, you have aristotle logic and it seems you can have non-Aristotlean logic too, the trivlent logic (of Aymara, a southamercian people) https://aymara.org/biblio/html/igr/igr3.html
you have Euclidean geometry and you can also become non-Euclidean, you have aristotle logic and it seems you can have non-Aristotlean logic too, the trivlent logic (of Aymara, a southamercian people) https://aymara.org/biblio/html/igr/igr3.html