In this paper, we investigate 2-absorbing ideals of commutative semirings and prove that if a is a nonzero proper ideal of a subtractive valuation semiring S then a is a 2-absorbing ideal of S if and only if a = p or a = p(2) where p = root a is a prime ideal of S. We also show that each 2-absorbing ideal of a subtractive semiring S is prime if and only if the prime ideals of S are comparable and if p is a minimal prime over a 2-absorbing ideal a, then am= p, where m is the unique maximal ideal of S.
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