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Daily Lesson
Learn with Numbo
Day 1 · Relations and Functions
Today let's learn about relations and functions!
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A relation from set A to set B is a subset of A×B — a collection of ordered pairs (a, b), where a comes from A and b comes from B.
A function is a special type of relation where each element in the domain is paired with exactly one element in the codomain.
If f(x) = x + 5, then f(2) = 2 + 5 = 7.
Activity: Check whether the pairs {(1,2), (1,3)} form a function, and explain why or why not.
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