This file is indexed.

/usr/lib/R/site-library/gsl/INDEX is in r-cran-gsl 1.9-10-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Airy                    Airy functions
Bessel                  Bessel functions
Clausen                 Clausen functions
Coulomb                 Coulomb functions
Coupling                Coupling functions
Dawson                  Dawson functions
Debye                   Debye functions
Dilog                   Dilog functions
Ellint                  Elliptic functions
Elljac                  Elliptic functions
Error                   Error functions
Expint                  exponential functions
Fermi_Dirac             Fermi-Dirac functions
Gamma                   gamma functions
Gegenbauer              Gegenbauer functions
Hyperg                  Hypergeometric functions
Laguerre                Laguerre functions
Lambert                 Lambert's W function
Legendre                Legendre functions
Log                     Log functions
Misc                    Argument processing and general info
Poly                    Polynomials
Psi                     Psi (digamma) functions
Qrng                    Quasi-random sequences
Rng                     Random numbers generation
Synchrotron             Synchrotron functions
Transport               Transport functions
Trig                    Trig functions
Zeta                    Zeta functions
gsl-package             Wrappers for the Gnu Scientific Library
multimin                Function minimization
pow_int                 Power functions