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leanprover / lean4 Public

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feat: redefine HashSet.union and add lemmas #18366

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feat: redefine HashSet.union and add lemmas

feat: redefine HashSet.union and add lemmas #18366

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Summary
Jobs
- check-lean-files
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- Usage
- Workflow file

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check-lean-files

succeeded Sep 30, 2025 in 39s

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