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feat(order/heyting/regular): Heyting-regular elements
Define Heyting-regular elements of an Heyting lattice, namely those a such that aᶜᶜ = a, and prove that they form a boolean algebra.
- [ ] depends on: #15305
This PR/issue depends on:
- ~~leanprover-community/mathlib#15305~~ By Dependent Issues (🤖). Happy coding!
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