An onto or surjective function reaches every element of its codomain.
What Is Onto Function?
An onto or surjective function reaches every element of its codomain.
Examples of Onto Function
1
f(x)=x³ from ℝ to ℝ is onto.Formula and Key Points
Formula / rule
For every y in B, there exists x in A with f(x)=y.
- Know the definition and standard notation for Onto Function.
- Be able to recognise or compute onto function in a small example.
- Connect the concept to nearby topics in the same subject before using it in larger CSE problems.
Why This Matters in Computer Science
Used to model input-output behaviour in programs, APIs, algorithms, transformations and machine-learning pipelines.
Related Math Terms
Onto Function: Frequently Asked Questions
What is Onto Function?
An onto or surjective function reaches every element of its codomain.
Why is Onto Function useful in computer science?
Used to model input-output behaviour in programs, APIs, algorithms, transformations and machine-learning pipelines.