Add SetTheory.Set.mem_insert and mark it as simp - #267
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gaearon wants to merge 2 commits into
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Let's just do this in #268 |
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I've noticed there's no helper lemma for unwrapping >3 item sets in examples without referring to the insert instance.
Let's add one.
This will also be useful for stating Example 3.5.5 in #267.