https://courses.lumenlearning.com/ivytech-collegealgebra/chapter/introduction-to-functions-and-function-notation/
https://courses.lumenlearning.com/ivytech-collegealgebra/chapter/introduction-to-domain-and-range/
https://courses.lumenlearning.com/ivytech-collegealgebra/chapter/introduction-to-composition-of-functions/
https://courses.lumenlearning.com/ivytech-collegealgebra/chapter/introduction-to-inverse-functions/
http://stephendavies.org/brisk.pdf#page=53
http://stephendavies.org/brisk.pdf#page=56
https://discretemath.org/ads-latex/ads.pdf#Functions
https://ggc-discrete-math.github.io/functions.html#_functions
https://ggc-discrete-math.github.io/appendix_one.html#_appendix_1_library_of_functions
https://discrete.openmathbooks.org/dmoi3/sec_intro-functions.html
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