Ononot — Let \chiA(x) denote the characteristic function of set A, de

Guest Session: 1 Question Remaining. Create Account to save progress.

Set Theoryhard

0:00.0

Let $\chi_A(x)$ denote the characteristic function of set $A$ , defined as $\chi_A(x) = 1$ if $x \in A$ and $\chi_A(x) = 0$ if $x \notin A$ . For any elements $x$ in the universal set $U$ , which of the following statements is equivalent to the assertion that $A \subseteq B$ ?