Usage History of 'invariants'

The following chart shows how frequently 'invariants' appeared in printed materials over time. For example, the word 'invariants' occurred 4 times in books in 1812 and 18,001 times in 2008. From 1812 to 2008, the word 'invariants' was used a total of 526,421 times in books scanned by Google. See Reference: Google Ngram project.

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