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考虑特征函数 \chi_A(x) = 1 如果 x in A ,否则 0 。对 A = [0, 1] ,草绘。求定义域和值域。
考虑特征函数 \chi_A(x) = 1 如果 x in A ,否则 0 。对 A = [0, 1] ,草绘。求定义域和值域。
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