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leanprover / lean4 Public

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feat: redefine HashSet.union and add lemmas #18426

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feat: redefine HashSet.union and add lemmas

feat: redefine HashSet.union and add lemmas #18426

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

Usage Workflow file

Run time

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Job	Run time
check-lean-files	34s
	34s

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