There are a couple philosophies in that vein, like finitism or constructivism. Not exactly mainstream but they’ve proven more than you’d expect https://en.wiki

There are a couple philosophies in that vein, like finitism or constructivism. Not exactly mainstream but they’ve proven more than you’d expect https://en.wikipedia.org/wiki/Finitism https://en.wikipedia.org/wiki/Finitism https://en.wikipedia.org/wiki/Constructivism_(philosophy_of_mathematics) https://en.wikipedia.org/wiki/Constructivism_(philosophy_of_...