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 $\mathbb{M}_{p+1}$
$\mathbb{M}_{p+1}$Published online by Cambridge University Press: 24 March 2020
Let  $p$ be an odd prime. The unary algebra consisting of the dihedral group of order
$p$ be an odd prime. The unary algebra consisting of the dihedral group of order  $2p$, acting on itself by left translation, is a minimal congruence lattice representation of
$2p$, acting on itself by left translation, is a minimal congruence lattice representation of  $\mathbb{M}_{p+1}$.
$\mathbb{M}_{p+1}$.