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“Cardinal Numbers” is a category for books in which quantity, measurement, and magnitude are central to the theme, structure, or stakes. It spans popular mathematics and data-driven nonfiction (number theory, statistics, economics, demography, ecology), as well as fiction and memoir that use tallies, lists, scores, ledgers, and inventories as narrative engines. These works ask “How many?”—probing scale, accumulation, scarcity, abundance, and the ethics of what we choose to count—whether the subject is money, time, love, risk, or entire populations. From code-and-prime thrillers to essays on metrics and the quantified self, the common thread is that numbers don’t just appear in the margins; they shape meaning, drive decisions, and determine what “counts.”

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