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feat(ring_theory/graded_algebra/homogeneous_ideal): definition of irr…
…elevant ideal of a graded algebra (#12548) For an `ℕ`-graded ring `⨁ᵢ 𝒜ᵢ`, the irrelevant ideal refers to `⨁_{i>0} 𝒜ᵢ`. This construction is used in the Proj construction in algebraic geometry.
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