In his paper [E. Turunen: Algebraic analysis of LPC+Ch calculus. Kybernetika 31 (1995), 1, 99-106] Turunen says in Corollary on p. 106: \begin{center} \begin{minipage}[t]{11.5cm} "\ldots (Notice that the third last line on page 195 in [2] stating that LPC+Ch Calculus is consistent is not correct.)" \end{minipage} \end{center} The reference [2] in Turunen's paper is J. K. Mattila: Modifier logic. In: Fuzzy Logic for the Management of Uncertainty (J.Kacprzyk and L. A. Zadeh, eds.). J. Wiley, New York 1992, pp. 191-209. \medskip The system LPC+Ch is consistent, which can be seen quite trivially.