/usr/lib/R/site-library/contfrac/INDEX is in r-cran-contfrac 1.1-10-1.
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The actual contents of the file can be viewed below.
1 2 3 4 5 | CF Continued fraction convergent
as_cf Approximates a real number in continued
fraction form
contfrac-package Continued fractions
convergents Partial convergents of continued fractions
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