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th3 b()()k 1s uNr34d4b13

Eu me divirto na Amazon. Cenário: painel de críticas de leitores da Amazon. Livro: “The Road to Reality – A Complete Guide to the Laws of the Universe“, considerado uma das novas bíblias da ciência contemporânea. Autor: Roger Penrose, renomado professor da Oxford University e parceiro-escritor de Stephen Hawking. Título da crítica do leitor: “The book is unreadable” (quáquáquá). Trecho que ele mesmo selecionou (vale a pena):

“If H were a *simple* bivector, so that the 2-form H# would also be simple, then the 2-plane element determined by H# would be precisely the same as the 2-plane element determined by H. On the other hand, the index-raising that takes us from a 2-form Hab to a bivector Hab = Hcd gca gdb, has a more significant geometrical effect. The Hodge dual, as applied to the 2-form Hab, taking us to eabcd Hcd, i.e. to H#, employs the index raising Hab –> Hab, and therefore involves passing to the orthogonal complement…”