* A concatenation of propositional expressions in the form <math>e_1~e_2~\ldots~e_{k-1}~e_k</math> indicates that all of the propositions <math>e_1, e_2, \ldots, e_{k-1}, e_k</math> are true, in other words, that their [[logical conjunction]] is true. | * A concatenation of propositional expressions in the form <math>e_1~e_2~\ldots~e_{k-1}~e_k</math> indicates that all of the propositions <math>e_1, e_2, \ldots, e_{k-1}, e_k</math> are true, in other words, that their [[logical conjunction]] is true. |