Definition: Let and be two functions, with their domains and codomains as written. The composition of and , denoted by , is the function that takes to —this last phrase is often denoted by . In other words, .
This is an extremely important definition, and for more details check out lesson 31!
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My pleasure! I’m glad to hear that you like site 🙂 And if you like the site then I’m sure you’ll also like the book that just got published, see the most recent blog post for a link to it (it’s also on Amazon now too). I hope you continue to enjoy! 🙂 🙂