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BTW, is there any member who has formally studied the "donut=coffee mug" subject here? Topology. I'd like a good book recommendation for it please. I am interested in studying it.

Can't believe that we have a thread on Maths yet noone has bothered posting these videos here:- ^This is what made me love Maths. Before I used to dislike it. For anyone having problem with Ricci calculus:-