For two fuzzy sets A and B, with membership functions m_A and m_B , the fuzzy set whose membership function m_A⊕B has the value m_A(x ) + m_B(x ) for every element x for which m_A(x ) + m_B(x ) ≤ 1, and has the value 1 for every element x for which m_A(x ) + m_B(x ) ≧ 1.