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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.04146 |
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Table of Contents:
- Implicational bases are a well-known representation of closure spaces and their closure lattices. This representation is not unique, though, and a closure space usually admits multiple bases. Among these, the canonical base, the canonical direct base as well as the $D$-base aroused significant attention due to their structural and algorithmic properties. Recently, a new base has emerged from the study of free lattices: the $E$-base. It is a refinement of the $D$-base that, unlike the aforementioned implicational bases, does not always accurately represent its associated closure space. This leads to an intriguing question: for which classes of (closure) lattices do closure spaces have valid $E$-base? Lower-bounded lattices are known to form such a class. In this paper, we prove that for semidistributive lattices, the $E$-base is both valid and minimum. We also characterize those modular and geometric lattices that have valid $E$-base. Finally, we prove that any lattice is a sublattice of a lattice with valid $E$-base.