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Let A be a normal class of algebra. In the present paper, we characterize the following four problems for A: for which radical class R, there holds that(1) R(i1∧A i2) = R(i1)∧AR(i2);(2) R(i1∨i2) = R(i1)∨R(i2);(3) (i1∧i2) = i1∧i2;(4) (i1 ∨ i2) = i1 ∨ i2, f