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Image: Rieger-Nishimura

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Description: Hasse diagram of the Rieger–Nishimura lattice: the free Heyting algebra over one generator, or intuitionistic propositional formulas in one variable. It is the dual of the Rieger–Nishimura ladder.
Title: Rieger-Nishimura
Credit: Own work
Author: EmilJ
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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