| ▲ | pfortuny 5 hours ago | |
Exactly. That is why the "forgetful functor" seems at first sight stupid and when you think a bit, it is genius. | ||
| ▲ | btilly 3 hours ago | parent [-] | |
When you think about it, creating a structure modulo some relation or kind of symmetry, is also a kind of targeted forgetting. | ||