Joins and meets in effect algebras

Grzegorz Binczak, Joanna Kaleta, Andrzej Zembrzuski

We know that each effect algebra $E$ is isomorphic to $\pi (X)$ for some $E$-test spaces $(X,\mathcal{T})$.We describe when $\pi (x)\vee \pi (y)$ and $\pi (x)\wedge \pi (y)$ exists for $x,y\in{\cal E}…