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exists_semiring_unique_left_maximal_not_unique_right_maximal

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There exists a semiring with a unique left maximal ideal but more than one right maximal ideals.

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Lean 4 Statement 
theorem exists_semiring_unique_left_maximal_not_unique_right_maximal :
    ∃ (R : Type) (_ : Semiring R), (∃! I : Ideal R, I.IsMaximal) ∧
      ∃ I J : Ideal Rᵐᵒᵖ, I.IsMaximal ∧ J.IsMaximal ∧ I ≠ J
ID: Mathoverflow__486451__exists_semiring_unique_left_maximal_not_unique_right_maximal
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