“…The modal µ-calculus µL, going back to [26], is used to express and model check properties interpreted over LTS, which subsumes more intuitive popular temporal logics like LTL and CTL. The model-checking approaches of [5,14,16,18,19] are based on LTL, those of [4,6,15,17,28] on CTL and those of [3,7,8,10,29,31] on the µ-calculus. In line with the recommendations from [1] to "adopt and extend state-of-the-art analysis tools" and to "analyze feature combinations corresponding to products of the product line", in this paper we propose two variants of µL, coined µL f and µL ′ f , for FTS.…”