@l-lafforgue Thank you for your interesting comment. I would like to add one remark to it. As you wrote, some categories can be thought to belong ...

@ocaramello Thank you for your answer. I will have a look to your paper. I think I will start by looking at explicit examples such as the Yoneda emb...

Many thanks for your answer. I now have a better understanding of the technique of bridges. I found the lecture very interesting, especially the last ...