[10 pts] Prove that for every rational number z, there exists irrational number x and y such that $x + y = z$. [6 pts] Provide a counterexample for if $A \cap C \subseteq B \cap C$, then $A \subseteq B$.
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Assume that for some rational number z, there does not exist any irrational numbers x and y such that x + y = z. This means that for every irrational number x and y, x + y is not equal to z. However, we know that the sum of two irrational numbers is always Show more…
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