Abbreviation: CyInFL

A \emph{cyclic involutive FL-algebra} or \emph{cyclic involutive residuated lattice} is a structure $\mathbf{A}=\langle A, \vee, \wedge, \cdot, 1, \sim\rangle$ of type $\langle 2, 2, 2, 0, 1\rangle$ such that

$\langle A, \vee, \wedge\rangle$ is a lattice

$\langle A, \cdot, 1\rangle$ is a monoid

$\sim$ is an \emph{involution}: ${\sim}{\sim}x=x$ and

$xy\le z\iff x\le {\sim}(y({\sim}z))\iff y\le {\sim}(({\sim}z)x)$

Let $\mathbf{A}$ and $\mathbf{B}$ be involutive residuated lattices. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\rightarrow B$ that is a homomorphism: $h(x \vee y)=h(x) \vee h(y)$, $h(x \cdot y)=h(x) \cdot h(y)$, $h({\sim}x)={\sim}h(x)$ and $h(1)=1$.

An \emph{involutive FL-algebra} is an FL-algebra $\mathbf{A}=\langle A,\vee,\wedge,\cdot,1,\backslash,/,0\rangle$ such that

cyclic involution holds: $(0/x)\backslash 0=x=0/(x\backslash 0)$ and $0/x=x\backslash 0$

Example 1:

$\begin{array}{lr}

f(1)= &1\\
f(2)= &1\\
f(3)= &2\\
f(4)= &9\\
f(5)= &21\\

\end{array}\begin{array}{lr}

f(6)= &101\\
f(7)= &279\\
f(8)= &1433\\
f(9)= &\\
f(10)= &\\

\end{array}$

Cyclic integral involutive FL-algebras subvariety

involutive FL-algebras supervariety