BCK-lattices

http://math.chapman.edu/structuresold/files/BCK-lattices.pdf

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\begin{document}
\textbf{\Large BCK-lattices}
\quad\href{http://math.chapman.edu/cgi-bin/structures?action=edit;id=BCK-lattices}{edit}

\abbreviation{BCKlat}
\begin{definition}
A \emph{BCK-lattice} is a structure $\mathbf{A}=\langle A,\vee,\wedge,\rightarrow,1\rangle$ of type $\langle 2,2,2,0\rangle$ such that

$\langle A,\vee,\rightarrow,1\rangle$ is a \href{BCK-join-semilattices.pdf}{BCK-join-semilattice}

$\langle A,\wedge,\rightarrow,1\rangle$ is a \href{BCK-meet-semilattices.pdf}{BCK-meet-semilattice}

Remark: 
$x\le y \iff x\rightarrow y=1$ is a partial order, with $1$ as greatest element, and $\vee$, $\wedge$ are a join and meet for this order. \cite{Idziak1984}
\end{definition}

\begin{morphisms}
Let $\mathbf{A}$ and $\mathbf{B}$ be BCK-lattices. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\rightarrow B$ that is a homomorphism: 

$h(x\vee y)=h(x)\vee h(y)$, $h(x\wedge y)=h(x)\wedge h(y)$, $h(x\rightarrow y)=h(x)\rightarrow h(y)$ and $h(1)=1$.
\end{morphisms}

\begin{basic_results}
\end{basic_results}

\begin{examples}
\begin{example}
\end{example}
\end{examples}

\begin{table}[h]
\begin{properties} (\href{http://math.chapman.edu/cgi-bin/structures?Properties}{description})

\begin{tabular}{|ll|}\hline
Classtype & variety\\\hline
Equational theory & \\\hline
Quasiequational theory & \\\hline
First-order theory & \\\hline
Locally finite & \\\hline
Residual size & \\\hline
Congruence distributive & yes\\\hline
Congruence modular & yes\\\hline
Congruence n-permutable & yes $n=2$\\\hline
Congruence regular & \\\hline
Congruence uniform & \\\hline
Congruence extension property & \\\hline
Definable principal congruences & \\\hline
Equationally def. pr. cong. & \\\hline
Amalgamation property & \\\hline
Strong amalgamation property & \\\hline
Epimorphisms are surjective & \\\hline
\end{tabular}
\end{properties}
\end{table}

\begin{finite_members} $f(n)=$ number of members of size $n$.

$\begin{array}{lr}
f(1)= &1\\
f(2)= &\\
f(3)= &\\
f(4)= &\\
f(5)= &\\
f(6)= &\\
\end{array}$
\end{finite_members}

\hyperbaseurl{http://math.chapman.edu/structures/files/}
\begin{subclasses}\ 

\href{Heyting_algebras.pdf}{Heyting algebras} 

\end{subclasses}
\begin{superclasses}\ 

\href{BCK-join-semilattices.pdf}{BCK-join-semilattices} 

\href{BCK-meet-semilattices.pdf}{BCK-meet-semilattices} 

\end{superclasses}

\begin{thebibliography}{10}

\bibitem{Idziak1984}
Pawel M. Idziak, \emph{Lattice operation in BCK-algebras},
Math. Japon., \textbf{29}, 1984, 839--846 \href{http://www.ams.org/mathscinet-getitem?mr=87b:06025a}{MRreview}

\end{thebibliography}

\end{document}
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