Onto function

(Surjection) #

A function f from set ‘A’ to set ‘B’ is onto if each and every element of B is mapped/associated to atleast one element of A If $b\in B\\ \exists a\in A\\ s.t.\\ f(a)=b$

Property/Condition #

• Codomain of f = B = range of f
• If f:A→B is onto, |A|=x and |B|=y, then x≥y