I have been reading Kevin C. Klement's article on Gottlob Frege in the Internet Encyclopedia of Philosophy. I am confused by the term "value-range", which is used numerous times throughout the article. Here is what is said about it:
"value-ranges" (Werthverläufe) of functions, understood as objects corresponding to the complete argument-value mappings generated by functions.
I could use some help parsing this concept.