He doesn’t say this.

> NOT the same as the "isomorphic equivalence" which is more difficult, strict, and abstract.

This is what the exercise is about. So I would recommend reading before making assumptions.

Of course there are more than one definition of equivalence and isomorphism, but the one explored there is just as interesting as the comment I’m replying to.

drpossum you stop with these gotcha posts? This is our 3rd encounter.