- #1
oliphant
- 15
- 0
Homework Statement
We're asked to prove that a few constructions of the sets a,b are themselves sets, stating which axioms we use to do so.
a) a\b
b)the function f:a->b
c)the image of f
Homework Equations
The following standard definitions of axioms of construction: Extensionality, Pair Set, Power Set, Union, Subset
The Attempt at a Solution
I think for a) we could define a\b = [tex]\{\bigcup (x \in P(a)) | x \notin b \}[/tex] so we would be using the axioms of power set, union, subset.
Now I have no idea how to do b), and I'd need to define that set first before I could do c). So if someone could point me in the right direction that would be great.