Re: are fibrations evil?

Dear John, A property is "evil" in your sense if it is not invariant under equivalences. Invariance under equivalence is a well established mathematical notion. I prefer to say that something is not invariant under equivalence than to say that it is "evil". There is no need to introduce a new terminology. Best, André [For admin and other information see: http://www.mta.ca/~cat-dist/ ]