- #1
SclayP
- 27
- 0
So, i have to analyze the next function and see if it is injective and surjective
f: NXN → N
f(x,y)=x+y
i know that a function to be injective f(a)=f(b) → a=b
but here i have that f(a,c)=f(b,d) → (a,c)=(b,d)
next thing i do: a+c =b+d
now i don't know what to do...PLEASE HELP ME
f: NXN → N
f(x,y)=x+y
i know that a function to be injective f(a)=f(b) → a=b
but here i have that f(a,c)=f(b,d) → (a,c)=(b,d)
next thing i do: a+c =b+d
now i don't know what to do...PLEASE HELP ME