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Google Books Ngram Viewer: Algebra, Arithmetic, Geometry, Topology

This is Google Trends for all published (and scanned) English books in the past 200 years (1800-2000) about the ngrams: Algebra, Arithmetic, Set theory, Calculus, Geometry, Topology, Combinatorics, Number theory and Differential equations.
Google labs Ngram Mathematics 1800-2000

You can access the dataset at www.culturomics.org.

Culturomics and the new Google tool for tracking cultural trends

The field of "culturomics" promises humanities researchers a robust quantitative tool to analyze cultural trends back to the 1500s.

n-gram

An n-gram is a subsequence of n items from a given sequence. The items in question can be phonemes, syllables, letters, words or base pairs according to the application.

An n-gram of size 1 is referred to as a "unigram"; size 2 is a "bigram" (or, less commonly, a "digram"); size 3 is a "trigram"; and size 4 or more is simply called an "n-gram". Some language models built from n-grams are "(n − 1)-order Markov models".

An n-gram model is a type of probabilistic model for predicting the next item in such a sequence. n-gram models are used in various areas of statistical natural language processing and genetic sequence analysis. Source: Wikipedia, n-gram.
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