Intelligent Design Mathematics Mind

Can a simple triangle disprove materialism?

Edward Feser: When we grasp that formal nature of being a triangle, we are grasping something that is totally abstract. It applies to every single triangle that has existed, does exist, will exist or, for that matter, could exist, whether it is a triangle drawn in ink, whether it is a triangle drawn in sand, whether it is a triangle you construct by putting three sticks together, whether it is a triangle formed by the side of a pyramid, the idea or the concept is entirely abstract.