For the set of physics books, we can choose from five books as the first book, four books for the second, three for the third, two for the fourth, and one book for the last book, so we have 120 (5*4*3*2*1 = 5! = 120) different ways to arrange these five books.
That's a workable description of what Sapiens is, though it's a history book only in the sense that Stephen Hawking's A Brief History of Time is a physics book (Sapiens' subtitle – A Brief History of Humankind – suggests that this is not entirely coincidental).
If each book can be broadly categorized as either a biology book or a physics book, our set includes an equal number of biology books (Darwin, Gould, Linneaus, Schrodinger, and Simpson) and physics books (Copernicus, Einstein, Hawking, Hubble, and Newton).
Force yourself to study your physics book.
He had no friends, preferring the companionship of calculus and physics books.
Since for every one of the 120 different ways to arrange the biology books there is still 120 different ways to arrange the physics books, the multiplicity of the two sets is giving as the product of the individual pieces, 120*120 = 14,400.
These 10 books consist of five biology books (Darwin 1859; Gould 1989; Von Linnaeus 1758; Schrodinger 1944; and Simpson 1951) and five physics books (Copernicus 1543; Einstein 1916; Hawking 1998; Hubble 1982; and Newton 1686).
This research was later published by the American Institute of Physics as the book, Quantum Physics in America: The Years through 1935.
One of Fermi's first sources for the study of physics was a book found at the local market of Campo de' Fiori in Rome.
Reichenbach's most original work on the foundations of physics is in three books, Axiomatization of the Theory of Relativity (1924h), Philosophical Foundations of Quantum Mechanics (1944b), and The Direction of Time (1956b).
He'd treat old sayings and clichés on a par with the laws of physics, like in the eighth Discworld book Guards, Guards where saving the day rests entirely on the fact that million-to-one chances always happen when you need them.
