Sounds fantastic. From a review by Brian Hayes in American Scientist:

In William Goldbloom Blochâ€™s mathematical companion to â€œThe Library of Babel,â€ the first task is to calculate the number of distinct books that can be created in this way. Thereâ€™s not much to it. Borges tells us that the alphabet of the books is restricted to 25 symbols (22 letters, the comma, the period and the word space). He also mentions that each book has 410 pages, with 40 lines of 80 characters on each page. Thus a book consists of 410 Ã— 40 Ã— 80 = 1,312,000 symbols. [...]

These combinatorial exercises are the most obvious instances where mathematics can illuminate the Borges story, but Bloch finds much else to comment on as well. [...] Borges describes the library as a close-packed array of hexagonal rooms. Four walls of each hexagon are lined with bookshelves, holding a total of 640 books; the other two walls provide portals to adjacent hexagons. Vertically, the levels of the library are connected by ventilation shafts and spiral stairways. This design has some curious consequences. For example, Bloch points out that somewhere in the library there must be at least one hexagon whose shelves are not full. The reason is that 25

^{1,312,000}is not evenly divisible by 640For me the biggest surprise in Blochâ€™s commentary comes in a chapter that applies ideas from graph theory to the layout of the library. [...]

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