Usage History of 'extensional'

The following chart shows how frequently 'extensional' appeared in printed materials over time. For example, the word 'extensional' occurred 2 times in books in 1828 and 14,215 times in 2008. From 1828 to 2008, the word 'extensional' was used a total of 475,112 times in books scanned by Google. See Reference: Google Ngram project.

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