Functions
A rule that takes each input to exactly one output, like f(x) = x². The central object of most of mathematics.
Depth 1 · Foundation
You can evaluate a function, read its graph, and tell whether a rule is a function at all.
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- 1
Foundation
You can evaluate a function, read its graph, and tell whether a rule is a function at all.
Opens after
Variables - 2
Deeper
You can reason about how a function behaves near a point - its trend and its instantaneous rate of change.
Your path here
What's still between you and Functions, depth 1, in the order you can learn it.
- 1CountingDepth 1 · Foundation · Number Systems
- 2Natural numbersDepth 1 · Foundation · Number Systems
- 3ZeroDepth 1 · Foundation · Number Systems
- 4The number lineDepth 1 · Foundation · Number Systems
- 5NumeralsDepth 1 · Foundation · Number Systems
- 6Place valueDepth 1 · Foundation · Number Systems
- 7Comparing numbersDepth 1 · Foundation · Number Systems
- 8IntegersDepth 1 · Foundation · Number Systems
- 9VariablesDepth 1 · Foundation · Algebra
- 10FunctionsDepth 1 · Foundation · Algebra
Where it fits
Makes these deeper
Once you know Functions, come back to these — they'll mean more.