- #1
mathcnc
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Homework Statement
Prove by induction that if set S = {x1,x2...,xn} is a set of n elements non of which are in a set A, then AuS is denumerable
Homework Equations
im not sure what to put here
The Attempt at a Solution
what does this mean
denumerable? and how do i start this
I know that i can say AuX when x is an element not in A
but what do i do beyond this